Warn about Web Audio without user gesture on Android no longer allowed on cross origin iframes.

Warn about Web Audio without user gesture on Android no longer allowed on cross origin iframes.

This is a CL to send to M54 to warn users of Web Audio in cross origin iframes.

Note that because of how Web Audio work this warning (and the use counter) are
larger than reality: every `new AudioContext` in a cross origin iframe will warn
if not inside an event handler even if they are not meant to be used yet.

Intent to Intervene: https://groups.google.com/a/chromium.org/d/msg/blink-dev/51WbTwn0M_Y/VZuwn8-VAAAJ

BUG=617090
Review-Url: https://codereview.chromium.org/2311233002
Cr-Commit-Position: refs/heads/master@{#418201}
(cherry picked from commit 8e94d8acbaf7ffca80e06429422fe8cbd311f781)

Committed: https://chromium.googlesource.com/chromium/src/+/2fb1bdf0ffe1d08ed7ec098de07daf59447a1903

[mlamouri (slow - plz ping), 2016-09-13 09:19:14]

Description was changed from

==========
Warn about Web Audio without user gesture on Android no longer allowed on cross
origin iframes.

This is a CL to send to M54 to warn users of Web Audio in cross origin iframes.

Note that because of how Web Audio work this warning (and the use counter) are
larger than reality: every `new AudioContext` in a cross origin iframe will warn
if not inside an event handler even if they are not meant to be used yet.

Intent to Intervene:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/51WbTwn0M_Y/VZuwn8-V...

BUG=617090

Review-Url: https://codereview.chromium.org/2311233002
Cr-Commit-Position: refs/heads/master@{#418201}
(cherry picked from commit 8e94d8acbaf7ffca80e06429422fe8cbd311f781)
==========

to

==========
Warn about Web Audio without user gesture on Android no longer allowed on cross
origin iframes.

This is a CL to send to M54 to warn users of Web Audio in cross origin iframes.

Note that because of how Web Audio work this warning (and the use counter) are
larger than reality: every `new AudioContext` in a cross origin iframe will warn
if not inside an event handler even if they are not meant to be used yet.

Intent to Intervene:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/51WbTwn0M_Y/VZuwn8-V...

BUG=617090

Review-Url: https://codereview.chromium.org/2311233002
Cr-Commit-Position: refs/heads/master@{#418201}
(cherry picked from commit 8e94d8acbaf7ffca80e06429422fe8cbd311f781)

Committed:
https://chromium.googlesource.com/chromium/src/+/2fb1bdf0ffe1d08ed7ec098de07d...
==========

[mlamouri (slow - plz ping), 2016-09-13 09:19:15]

Committed patchset #1 (id:1) manually as
2fb1bdf0ffe1d08ed7ec098de07daf59447a1903.