components/omnibox/common/omnibox_features.cc

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/omnibox/common/omnibox_features.h"

#include "build/build_config.h"

namespace omnibox {

const auto enabled_by_default_desktop_only =
#if defined(OS_ANDROID) || defined(OS_IOS)
    base::FEATURE_DISABLED_BY_DEFAULT;
#else
    base::FEATURE_ENABLED_BY_DEFAULT;
#endif

const auto enabled_by_default_android_only =
#if defined(OS_ANDROID)
    base::FEATURE_ENABLED_BY_DEFAULT;
#else
    base::FEATURE_DISABLED_BY_DEFAULT;
#endif

const auto enabled_by_default_ios_only =
#if defined(OS_IOS)
    base::FEATURE_ENABLED_BY_DEFAULT;
#else
    base::FEATURE_DISABLED_BY_DEFAULT;
#endif

const auto enabled_by_default_desktop_android =
#if defined(OS_IOS)
    base::FEATURE_DISABLED_BY_DEFAULT;
#else
    base::FEATURE_ENABLED_BY_DEFAULT;
#endif

const auto enabled_by_default_desktop_ios =
#if defined(OS_ANDROID)
    base::FEATURE_DISABLED_BY_DEFAULT;
#else
    base::FEATURE_ENABLED_BY_DEFAULT;
#endif

// Allows Omnibox to dynamically adjust number of offered suggestions to fill in
// the space between Omnibox an the soft keyboard. The number of suggestions
// shown will be no less than minimum for the platform (eg. 5 for Android).
const base::Feature kAdaptiveSuggestionsCount{
    "OmniboxAdaptiveSuggestionsCount", base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to hide the scheme from steady state URLs displayed in the
// toolbar. It is restored during editing.
const base::Feature kHideFileUrlScheme{
    "OmniboxUIExperimentHideFileUrlScheme",
    // Android and iOS don't have the File security chip, and therefore still
    // need to show the file scheme.
    enabled_by_default_desktop_only};

// Feature used to enable local entity suggestions. Similar to rich entities but
// but location specific. E.g., typing 'starbucks near' could display the local
// entity suggestion 'starbucks near disneyland \n starbucks * Anaheim, CA'.
const base::Feature kOmniboxLocalEntitySuggestions{
    "OmniboxLocalEntitySuggestions", base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to enable swapping the rows on answers.
const base::Feature kOmniboxReverseAnswers{"OmniboxReverseAnswers",
                                           base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to enable matching short words to bookmarks for suggestions.
const base::Feature kOmniboxShortBookmarkSuggestions{
    "OmniboxShortBookmarkSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to force on the experiment of transmission of tail suggestions
// from GWS to this client, currently testing for desktop.
const base::Feature kOmniboxTailSuggestions{"OmniboxTailSuggestions",
                                            base::FEATURE_DISABLED_BY_DEFAULT};

// Feature that enables the tab-switch suggestions corresponding to an open
// tab, for a button or dedicated suggestion. Enabled by default on Desktop
// and iOS.
const base::Feature kOmniboxTabSwitchSuggestions{
    "OmniboxTabSwitchSuggestions", enabled_by_default_desktop_ios};

// Feature used to enable various experiments on keyword mode, UI and
// suggestions.
const base::Feature kExperimentalKeywordMode{"OmniboxExperimentalKeywordMode",
                                             base::FEATURE_DISABLED_BY_DEFAULT};

// Feature to enable clipboard provider to suggest searching for copied images.
const base::Feature kEnableClipboardProviderImageSuggestions{
    "OmniboxEnableClipboardProviderImageSuggestions",
    enabled_by_default_ios_only};

// Feature to enable the search provider to send a request to the suggest
// server on focus.  This allows the suggest server to warm up, by, for
// example, loading per-user models into memory.  Having a per-user model
// in memory allows the suggest server to respond more quickly with
// personalized suggestions as the user types.
const base::Feature kSearchProviderWarmUpOnFocus{
    "OmniboxWarmUpSearchProviderOnFocus", enabled_by_default_desktop_android};

// Feature used to display the title of the current URL match.
const base::Feature kDisplayTitleForCurrentUrl{
    "OmniboxDisplayTitleForCurrentUrl", enabled_by_default_desktop_android};

// Feature used to always swap the title and URL.
const base::Feature kUIExperimentSwapTitleAndUrl{
    "OmniboxUIExperimentSwapTitleAndUrl", enabled_by_default_desktop_only};

// Feature used to enable speculatively starting a service worker associated
// with the destination of the default match when the user's input looks like a
// query.
const base::Feature kSpeculativeServiceWorkerStartOnQueryInput{
    "OmniboxSpeculativeServiceWorkerStartOnQueryInput",
    base::FEATURE_ENABLED_BY_DEFAULT};

// Feature used to fetch document suggestions.
const base::Feature kDocumentProvider{"OmniboxDocumentProvider",
                                      base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to autocomplete bookmark, history, and document suggestions when
// the user input is a prefix of their titles, as opposed to their URLs.
const base::Feature kAutocompleteTitles{"OmniboxAutocompleteTitles",
                                        base::FEATURE_DISABLED_BY_DEFAULT};

// Returns whether IsInstantExtendedAPIEnabled should be ignored when deciding
// the number of Google-provided search suggestions.
const base::Feature kOmniboxDisableInstantExtendedLimit{
    "OmniboxDisableInstantExtendedLimit", enabled_by_default_android_only};

// Show the search engine logo in the omnibox on Android (desktop already does
// this).
const base::Feature kOmniboxSearchEngineLogo{"OmniboxSearchEngineLogo",
                                             base::FEATURE_ENABLED_BY_DEFAULT};

// Feature used to allow users to remove suggestions from clipboard.
const base::Feature kOmniboxRemoveSuggestionsFromClipboard{
    "OmniboxRemoveSuggestionsFromClipboard", enabled_by_default_android_only};

// Feature to debounce drive requests from the document provider.
const base::Feature kDebounceDocumentProvider{
    "OmniboxDebounceDocumentProvider", base::FEATURE_DISABLED_BY_DEFAULT};

// Preserves the default match against change when providers return results
// asynchronously. This prevents the default match from changing after the user
// finishes typing. Without this feature, if the default match is updated right
// when the user presses Enter, the user may go to a surprising destination.
const base::Feature kOmniboxPreserveDefaultMatchAgainstAsyncUpdate{
    "OmniboxPreserveDefaultMatchAgainstAsyncUpdate",
    base::FEATURE_ENABLED_BY_DEFAULT};

// Demotes the relevance scores when comparing suggestions based on the
// suggestion's |AutocompleteMatchType| and the user's |PageClassification|.
// This feature's main job is to contain the DemoteByType parameter.
const base::Feature kOmniboxDemoteByType{"OmniboxDemoteByType",
                                         base::FEATURE_DISABLED_BY_DEFAULT};

// A special flag, enabled by default, that can be used to disable all new
// search features (e.g. zero suggest).
const base::Feature kNewSearchFeatures{"OmniboxNewSearchFeatures",
                                       base::FEATURE_ENABLED_BY_DEFAULT};

// Feature used to cap max zero suggestions shown according to the param
// OmniboxMaxZeroSuggestMatches. If omitted,
// OmniboxUIExperimentMaxAutocompleteMatches will be used instead. If present,
// OmniboxMaxZeroSuggestMatches will override
// OmniboxUIExperimentMaxAutocompleteMatches when |from_omnibox_focus| is true.
const base::Feature kMaxZeroSuggestMatches{"OmniboxMaxZeroSuggestMatches",
                                           base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to cap max suggestions shown according to the params
// UIMaxAutocompleteMatches and UIMaxAutocompleteMatchesByProvider.
const base::Feature kUIExperimentMaxAutocompleteMatches{
    "OmniboxUIExperimentMaxAutocompleteMatches",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to cap the number of URL-type matches shown within the
// Omnibox. If enabled, the number of URL-type matches is limited (unless
// there are no more non-URL matches available.) If enabled, there is a
// companion parameter - OmniboxMaxURLMatches - which specifies the maximum
// desired number of URL-type matches.
const bool kOmniboxMaxURLMatchesEnabledByDefault =
#if defined(OS_IOS) || defined(OS_ANDROID)
    false;
#else
    true;
#endif
const base::Feature kOmniboxMaxURLMatches{
    "OmniboxMaxURLMatches", kOmniboxMaxURLMatchesEnabledByDefault
                                ? base::FEATURE_ENABLED_BY_DEFAULT
                                : base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to cap max suggestions to a dynamic limit based on how many URLs
// would be shown. E.g., show up to 10 suggestions if doing so would display no
// URLs; else show up to 8 suggestions if doing so would include 1 or more URLs.
const base::Feature kDynamicMaxAutocomplete{"OmniboxDynamicMaxAutocomplete",
                                            base::FEATURE_DISABLED_BY_DEFAULT};

// If enabled, when the user clears the whole omnibox text (i.e. via Backspace),
// Chrome will request remote ZeroSuggest suggestions for the OTHER page
// classification (contextual web).
const base::Feature kClobberTriggersContextualWebZeroSuggest{
    "OmniboxClobberTriggersContextualWebZeroSuggest",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Used to adjust the age threshold since the last visit in order to consider a
// normalized keyword search term as a zero-prefix suggestion. If disabled, the
// default value of history::kLowQualityMatchAgeLimitInDays is used. If enabled,
// the age threshold is determined by this feature's companion parameter,
// OmniboxFieldTrial::kOmniboxLocalZeroSuggestAgeThresholdParam.
const base::Feature kOmniboxLocalZeroSuggestAgeThreshold{
    "OmniboxLocalZeroSuggestAgeThreshold", base::FEATURE_DISABLED_BY_DEFAULT};

// If enabled, ranks the local zero-prefix suggestions based on frecency
// (combined frequency and recency).
const base::Feature kOmniboxLocalZeroSuggestFrecencyRanking{
    "OmniboxLocalZeroSuggestFrecencyRanking",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Used to force enable/disable trending zero-prefix suggestions on the NTP
// (Omnibox and NTP realbox). This feature triggers a server-side behavior only
// and has no direct impact on the client behavior.
const base::Feature kOmniboxTrendingZeroPrefixSuggestionsOnNTP{
    "OmniboxTrendingZeroPrefixSuggestionsOnNTP",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Feature that configures ZeroSuggestProvider using the "ZeroSuggestVariant"
// per-page-classification parameter.
//
// Generally speaking - do NOT use this for future server-side experiments.
// Instead, create your a new narrowly scoped base::Feature for each experiment.
//
// Because our Field Trial system can only configure this base::Feature in a
// single study, and does not merge parameters, using this creates conflicts.
const base::Feature kOnFocusSuggestions{"OmniboxOnFocusSuggestions",
                                        base::FEATURE_ENABLED_BY_DEFAULT};

// Enables on-focus suggestions on the Open Web, that are contextual to the
// current URL. Will only work if user is signed-in and syncing, or is
// otherwise eligible to send the current page URL to the suggest server.
//
// There's multiple flags here for multiple backend configurations:
//  - Default (search queries)
//  - On-Content Suggestions
const base::Feature kOnFocusSuggestionsContextualWeb{
    "OmniboxOnFocusSuggestionsContextualWeb",
    base::FEATURE_DISABLED_BY_DEFAULT};
const base::Feature kOnFocusSuggestionsContextualWebOnContent{
    "OmniboxOnFocusSuggestionsContextualWebOnContent",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Enables Reactive Zero-Prefix Suggestions (rZPS) on the NTP, for the Omnibox
// and Realbox respectively. Note: enabling this feature merely makes
// ZeroSuggestProvider send the request. There are additional requirements,
// like the user being signed-in, and the suggest server having rZPS enabled.
const base::Feature kReactiveZeroSuggestionsOnNTPOmnibox{
    "OmniboxReactiveZeroSuggestionsOnNTPOmnibox",
    base::FEATURE_DISABLED_BY_DEFAULT};
const base::Feature kReactiveZeroSuggestionsOnNTPRealbox{
    "OmniboxReactiveZeroSuggestionsOnNTPRealbox",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Allow suggestions to be shown to the user on the New Tab Page upon focusing
// URL bar (the omnibox).
const base::Feature kZeroSuggestionsOnNTP{"OmniboxZeroSuggestionsOnNTP",
                                          base::FEATURE_ENABLED_BY_DEFAULT};

// Allow suggestions to be shown to the user on the New Tab Page upon focusing
// the real search box.
const base::Feature kZeroSuggestionsOnNTPRealbox{
    "OmniboxZeroSuggestionsOnNTPRealbox", base::FEATURE_ENABLED_BY_DEFAULT};

// Allow on-focus query refinements to be shown on the default SERP.
const base::Feature kZeroSuggestionsOnSERP{"OmniboxZeroSuggestionsOnSERP",
                                           base::FEATURE_ENABLED_BY_DEFAULT};

// Features to provide non personalized head search suggestion from a compact
// on device model. More specifically, feature name with suffix Incognito /
// NonIncognito will only controls behaviors under incognito / non-incognito
// mode respectively.
const base::Feature kOnDeviceHeadProviderIncognito{
    "OmniboxOnDeviceHeadProviderIncognito", base::FEATURE_DISABLED_BY_DEFAULT};
const base::Feature kOnDeviceHeadProviderNonIncognito{
    "OmniboxOnDeviceHeadProviderNonIncognito",
    base::FEATURE_DISABLED_BY_DEFAULT};

// If enabled, changes the way Google-provided search suggestions are scored by
// the backend. Note that this Feature is only used for triggering a server-
// side experiment config that will send experiment IDs to the backend. It is
// not referred to in any of the Chromium code.
const base::Feature kOmniboxExperimentalSuggestScoring{
    "OmniboxExperimentalSuggestScoring", base::FEATURE_DISABLED_BY_DEFAULT};

// If disabled, terms with no wordstart matches disqualify the suggestion unless
// they occur in the URL host. If enabled, terms with no wordstart matches are
// allowed but not scored. E.g., both inputs 'java script' and 'java cript' will
// match a suggestion titled 'javascript' and score equivalently.
const base::Feature kHistoryQuickProviderAllowButDoNotScoreMidwordTerms{
    "OmniboxHistoryQuickProviderAllowButDoNotScoreMidwordTerms",
    base::FEATURE_ENABLED_BY_DEFAULT};

// If disabled, midword matches are ignored except in the URL host, and input
// terms with no wordstart matches are scored 0, resulting in an overall score
// of 0. If enabled, midword matches are allowed and scored when they begin
// immediately after the previous match ends. E.g. 'java script' will match a
// suggestion titled 'javascript' but the input 'java cript' won't.
const base::Feature kHistoryQuickProviderAllowMidwordContinuations{
    "OmniboxHistoryQuickProviderAllowMidwordContinuations",
    base::FEATURE_ENABLED_BY_DEFAULT};

// If enabled, shows slightly more compact suggestions, allowing the
// kAdaptiveSuggestionsCount feature to fit more suggestions on screen.
const base::Feature kCompactSuggestions{"OmniboxCompactSuggestions",
                                        base::FEATURE_DISABLED_BY_DEFAULT};

// If enabled, defers keyboard popup when user highlights the omnibox until
// the user taps the Omnibox again.
extern const base::Feature kDeferredKeyboardPopup{
    "OmniboxDeferredKeyboardPopup", base::FEATURE_DISABLED_BY_DEFAULT};

// If enbaled, frequently visited sites are presented in form of a single row
// with a carousel of tiles, instead of one URL per row.
extern const base::Feature kMostVisitedTiles{"OmniboxMostVisitedTiles",
                                             base::FEATURE_DISABLED_BY_DEFAULT};

// If enabled, expands autocompletion to possibly (depending on params) include
// suggestion titles and non-prefixes as opposed to be restricted to URL
// prefixes. Will also adjust the location bar UI and omnibox text selection to
// accommodate the autocompletions.
const base::Feature kRichAutocompletion{"OmniboxRichAutocompletion",
                                        base::FEATURE_DISABLED_BY_DEFAULT};

// Feature that enables Search Ready Omnibox in incognito.
const base::Feature kOmniboxSearchReadyIncognito{
    "OmniboxSearchReadyIncognito", base::FEATURE_DISABLED_BY_DEFAULT};

// Feature that puts a single row of buttons on suggestions with actionable
// elements like keywords, tab-switch buttons, and Pedals.
const base::Feature kOmniboxSuggestionButtonRow{
    "OmniboxSuggestionButtonRow", base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to enable Pedal suggestions.
const base::Feature kOmniboxPedalSuggestions{"OmniboxPedalSuggestions",
                                             base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to enable the keyword search button.
const base::Feature kOmniboxKeywordSearchButton{
    "OmniboxKeywordSearchButton", base::FEATURE_DISABLED_BY_DEFAULT};

// Enables using an Android RecyclerView to render the suggestions dropdown
// instead of a ListView.
const base::Feature kOmniboxSuggestionsRecyclerView{
    "OmniboxSuggestionsRecyclerView", base::FEATURE_ENABLED_BY_DEFAULT};

// Allows long Omnibox suggestions to wrap around to next line.
const base::Feature kOmniboxSuggestionsWrapAround{
    "OmniboxSuggestionsWrapAround", base::FEATURE_DISABLED_BY_DEFAULT};

// If enabled, uses WebUI to render the omnibox suggestions popup, similar to
// how the NTP "fakebox" is implemented.
const base::Feature kWebUIOmniboxPopup{"WebUIOmniboxPopup",
                                       base::FEATURE_DISABLED_BY_DEFAULT};

// When enabled, use Assistant for omnibox voice query recognition instead of
// Android's built-in voice recognition service. Only works on Android.
const base::Feature kOmniboxAssistantVoiceSearch{
    "OmniboxAssistantVoiceSearch", base::FEATURE_DISABLED_BY_DEFAULT};

// When enabled, provides an omnibox context menu option that prevents URL
// elisions.
const base::Feature kOmniboxContextMenuShowFullUrls{
    "OmniboxContextMenuShowFullUrls", base::FEATURE_ENABLED_BY_DEFAULT};

// Feature used to reveal the path, query and ref from steady state URLs
// on hover.
const base::Feature kRevealSteadyStateUrlPathQueryAndRefOnHover{
    "OmniboxUIExperimentRevealSteadyStateUrlPathQueryAndRefOnHover",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to hide the path, query and ref from steady state URLs
// on interaction with the page.
const base::Feature kHideSteadyStateUrlPathQueryAndRefOnInteraction{
    "OmniboxUIExperimentHideSteadyStateUrlPathQueryAndRefOnInteraction",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Feature used to possibly elide not just the path, query, and ref from steady
// state URLs, but also subdomains beyond the registrable domain, depending on
// whether the hostname fails lookalike checks. Has no effect unless
// kRevealSteadyStateUrlPathQueryAndRefOnHover and/or
// kHideSteadyStateUrlPathQueryAndRefOnInteraction are enabled.
const base::Feature kMaybeElideToRegistrableDomain{
    "OmniboxUIExperimentElideToRegistrableDomain",
    base::FEATURE_DISABLED_BY_DEFAULT};

}  // namespace omnibox