Fixing MediaSessionDelegateAndroid referencing destroyed MediaSession

Fixing MediaSessionDelegateAndroid referencing destroyed MediaSession

There's a crash caused by asynchronous audio focus events.
MediaSessionDelegate may receive audio focus change signals after
MediaSession::~MediaSession is called. This CL adds checks to see if the
native MediaSession is destroyed before calling it's methods.

BUG=624208
Committed: https://crrev.com/90dcab0540458b409b6757076ab9115789c6a5e6
Cr-Commit-Position: refs/heads/master@{#403180}

[Zhiqiang Zhang (Slow), 2016-06-30 14:00:43]

zqzhang@chromium.org changed reviewers:
+ mlamouri@chromium.org

[Zhiqiang Zhang (Slow), 2016-06-30 14:00:55]

The CQ bit was checked by zqzhang@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-06-30 14:01:13]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[mlamouri (slow - plz ping), 2016-06-30 14:06:36]

lgtm

[mlamouri (slow - plz ping), 2016-06-30 14:06:59]

Thank you for having a look and fixing it this fast! :)

[commit-bot: I haz the power, 2016-06-30 15:09:20]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-30 15:09:21]

Dry run: This issue passed the CQ dry run.

[Zhiqiang Zhang (Slow), 2016-06-30 15:12:21]

The CQ bit was checked by zqzhang@chromium.org

[commit-bot: I haz the power, 2016-06-30 15:12:36]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-30 15:16:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-30 15:18:20]

Description was changed from

==========
Fixing MediaSessionDelegateAndroid referencing destroyed MediaSession

There's a crash caused by asynchronous audio focus events.
MediaSessionDelegate may receive audio focus change signals after
MediaSession::~MediaSession is called. This CL adds checks to see if the
native MediaSession is destroyed before calling it's methods.

BUG=624208
==========

to

==========
Fixing MediaSessionDelegateAndroid referencing destroyed MediaSession

There's a crash caused by asynchronous audio focus events.
MediaSessionDelegate may receive audio focus change signals after
MediaSession::~MediaSession is called. This CL adds checks to see if the
native MediaSession is destroyed before calling it's methods.

BUG=624208

Committed: https://crrev.com/90dcab0540458b409b6757076ab9115789c6a5e6
Cr-Commit-Position: refs/heads/master@{#403180}
==========

[commit-bot: I haz the power, 2016-06-30 15:18:21]

Patchset 1 (id:??) landed as
https://crrev.com/90dcab0540458b409b6757076ab9115789c6a5e6
Cr-Commit-Position: refs/heads/master@{#403180}