Fix amp img lightbox (ampproject#5279)

* ImageViewer class does not inherit `loadPromise`

* add simple test

* bind the function passed in since it is an instance method

don't remove side effect dist --fortesting (treated as dev) (ampproje…

…ct#5202)

Snap to the correct slide on orientationChange. (ampproject#5120)

* Snap to the correct slide on orientationChange.

* Add tests

Rename ampdocFor to ampdocServiceFor (ampproject#5088)

Revert "Standalone Doc: Only allow VISIBLE and HIDDEN visibility state (

ampproject#4732)" (ampproject#5083)

This reverts commit 5240c6d.

Escape font family with single quotes for fontloader. (ampproject#5035)

InMobi Ad extension for AMP (ampproject#4886)

* InMobi ad for amp

* Made changes for renderStart and noContentAvailable for NFR

* Fixed indentations and minor doc changes

Ensure canary cuts always run Travis. (ampproject#4973)

Canary cuts are hard checkouts, meaning they have no previous commit to
compare against. Because there's no comparison, the diff check would
return an empty string. Because the empty string passes the "not
anything that's not a doc change" check, it would skip Travis.

amp-ad file size fix : DO NOT import from integration.js (ampproject#…

…4951)

Several improvements to error reporting (ampproject#4878)

- thread through canary state into 3p iframe and report it.
- change throttling of error reporting by another factor of 10 for general traffic.

Unrelated: Forbid usage of `Object.assign` in 3p code as this showed up in error reports.