New feature: Bookmark Prompt Finch Experiment

When user is enrolled "Bookmark Prompt" field test. Chrome will show bookmark prompt bubble anchored by action box button, e.g. "+" mark, in location bar if user has visited currently displayed page frequently, e.g. user visited the page many times.

Design Doc:
https://docs.google.com/a/google.com/document/d/1M99Hg1jgkK1GCYywwxcYBx-V_nwVf0eh5PeBMkkdErQ/edit#

Note: Linux and Mac UI aren't supported. There are only stubs.

This is all in one patch except for GTK and Mac UI.

We have following components to implement bookmark prompt
 - BookmarkPromptPrefs (in this patch)
 - BookmarkPromptController (in this patch)
 - BookmarkPrompt UI http://codereview.chromium.org/11273030/
 - BookmarkCurrentPageFromStart() - new command, IDC_BOOKMARK_PAGE_FROM_STAR, doing as same as BookmarkCurrentPage() except for recording metrics

BUG=144586
[email protected]

Review URL: https://chromiumcodereview.appspot.com/11028114

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@165119 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/ui/browser_commands.h b/chrome/browser/ui/browser_commands.h
index bb01427..c7dc84ab 100644
--- a/chrome/browser/ui/browser_commands.h
+++ b/chrome/browser/ui/browser_commands.h
@@ -92,6 +92,7 @@
 void ConvertPopupToTabbedBrowser(Browser* browser);
 void Exit();
 void BookmarkCurrentPage(Browser* browser);
+void BookmarkCurrentPageFromStar(Browser* browser);
 bool CanBookmarkCurrentPage(const Browser* browser);
 void BookmarkAllTabs(Browser* browser);
 bool CanBookmarkAllTabs(const Browser* browser);