Handle Android stop capturer race.

Handle Android stop capturer race.

With the current order of stop capture processing on Android,
OnMemoryBufferFrame and OnTextureFrame may be called halfway through
Stop(). They must therefore check for the case of a null capturer_.

There used to be such checks, but they were accidantally removed in
commit #12895, cl https://codereview.webrtc.org/1973873003.

BUG=webrtc:5966
R=perkj@webrtc.org, sakal@webrtc.org

Committed: https://crrev.com/47183ba60bddfcdd1494d88f3c1fefc62eb9445b
Cr-Commit-Position: refs/heads/master@{#13031}

[nisse-webrtc, 2016-06-03 09:02:47]

nisse@webrtc.org changed reviewers:
+ perkj@webrtc.org, sakal@webrtc.org

[nisse-webrtc, 2016-06-03 09:02:48]

This should hopefully fix the Android stop capturer crashes.

[sakal, 2016-06-03 09:12:21]

lgtm

[perkj_webrtc, 2016-06-03 09:43:14]

lgtm

[nisse-webrtc, 2016-06-03 09:58:35]

The CQ bit was checked by nisse@webrtc.org

[commit-bot: I haz the power, 2016-06-03 09:58:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2033943004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2033943004/1

[commit-bot: I haz the power, 2016-06-03 10:11:09]

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

[commit-bot: I haz the power, 2016-06-03 10:11:10]

Try jobs failed on following builders:
  linux_ubsan_vptr on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/linux_ubsan_vptr/builds...)

[perkj_webrtc, 2016-06-03 11:04:04]

The CQ bit was checked by perkj@webrtc.org

[commit-bot: I haz the power, 2016-06-03 11:04:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2033943004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2033943004/1

[perkj_webrtc, 2016-06-03 11:05:38]

Description was changed from

==========
Handle Android stop capturer race.

With the current order of stop capture processing on Android,
OnMemoryBufferFrame and OnTextureFrame may be called halfway through
Stop(). They must therefore check for the case of a null capturer_.

There used to be such checks, but they were accidantally removed in
commit #12895, cl https://codereview.webrtc.org/1973873003.

BUG=webrtc:5966
==========

to

==========
Handle Android stop capturer race.

With the current order of stop capture processing on Android,
OnMemoryBufferFrame and OnTextureFrame may be called halfway through
Stop(). They must therefore check for the case of a null capturer_.

There used to be such checks, but they were accidantally removed in
commit #12895, cl https://codereview.webrtc.org/1973873003.

BUG=webrtc:5966
R=perkj@webrtc.org, sakal@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/47183ba60bddfcdd1494d88f3...
==========

[perkj_webrtc, 2016-06-03 11:05:40]

Committed patchset #1 (id:1) manually as
47183ba60bddfcdd1494d88f3c1fefc62eb9445b (presubmit successful).

[commit-bot: I haz the power, 2016-06-03 11:05:42]

Description was changed from

==========
Handle Android stop capturer race.

With the current order of stop capture processing on Android,
OnMemoryBufferFrame and OnTextureFrame may be called halfway through
Stop(). They must therefore check for the case of a null capturer_.

There used to be such checks, but they were accidantally removed in
commit #12895, cl https://codereview.webrtc.org/1973873003.

BUG=webrtc:5966
R=perkj@webrtc.org, sakal@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/47183ba60bddfcdd1494d88f3...
==========

to

==========
Handle Android stop capturer race.

With the current order of stop capture processing on Android,
OnMemoryBufferFrame and OnTextureFrame may be called halfway through
Stop(). They must therefore check for the case of a null capturer_.

There used to be such checks, but they were accidantally removed in
commit #12895, cl https://codereview.webrtc.org/1973873003.

BUG=webrtc:5966
R=perkj@webrtc.org, sakal@webrtc.org

Committed: https://crrev.com/47183ba60bddfcdd1494d88f3c1fefc62eb9445b
Cr-Commit-Position: refs/heads/master@{#13031}
==========