commit c5447db2943848192c0452c7b8e766a943335f07
author khushalsagar <khushalsagar@chromium.org> Tue Aug 22 17:53:01 2017
committer Commit Bot <commit-bot@chromium.org> Tue Aug 22 17:53:01 2017
tree ac315e64294301a8f4e8a72494eec3883706db59
parent 0fbacfb81345c38e0caa9d1d71edae9372065f6b

chrome/blink: Add functionality for in-product help for media elements.

IPH (In-product help) UI is added to highlight and assist in the
discovery of features in the browser. This change adds this
functionality for the download feature on media elements in blink. This
involves the following additions:

1) A public WebMediaIPH interface in blink that can be used to ask the
embedder to display IPH widgets for an element.

2) A mojo MediaIPHService to bridge these requests to the browser where
the UI can be shown using android pop-ups overlayed on the content.

3) An addition to the features supported by the FeatureEngagementTracker
for media download IPH.

The feature is currently gated behind a finch flag which is disabled by
default.

BUG=715185

Review-Url: https://codereview.chromium.org/2943983003
Cr-Commit-Position: refs/heads/master@{#496361}