Add tracing to VCMGenericEncoder::Release.

Add tracing to VCMGenericEncoder::Release.

This call can take time, especially on mobile HW encoders. Make sure it
shows up in tracing.

BUG=webrtc:5167
R=stefan@webrtc.org

Committed: https://chromium.googlesource.com/external/webrtc/+/4fd6cda06796e650d1ff65edf5dd08f3f1ae3223

[pbos-webrtc, 2016-01-20 20:30:10]

Hardest CL of your life. PTAL.

[stefan-webrtc, 2016-01-21 17:24:21]

lgtm

[commit-bot: I haz the power, 2016-01-26 09:20:06]

Description was changed from

==========
Add tracing to VCMGenericEncoder::Release.

This call can take time, especially on mobile HW encoders. Make sure it
shows up in tracing.

BUG=webrtc:5167
R=stefan@webrtc.org
==========

to

==========
Add tracing to VCMGenericEncoder::Release.

This call can take time, especially on mobile HW encoders. Make sure it
shows up in tracing.

BUG=webrtc:5167
R=stefan@webrtc.org

Committed: https://crrev.com/4fd6cda06796e650d1ff65edf5dd08f3f1ae3223
Cr-Commit-Position: refs/heads/master@{#11374}
==========

[pbos-webrtc, 2016-01-26 09:20:07]

Description was changed from

==========
Add tracing to VCMGenericEncoder::Release.

This call can take time, especially on mobile HW encoders. Make sure it
shows up in tracing.

BUG=webrtc:5167
R=stefan@webrtc.org

Committed: https://crrev.com/4fd6cda06796e650d1ff65edf5dd08f3f1ae3223
Cr-Commit-Position: refs/heads/master@{#11374}
==========

to

==========
Add tracing to VCMGenericEncoder::Release.

This call can take time, especially on mobile HW encoders. Make sure it
shows up in tracing.

BUG=webrtc:5167
R=stefan@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/4fd6cda06796e650d1ff65edf...
==========

[commit-bot: I haz the power, 2016-01-26 09:20:07]

Patchset 1 (id:??) landed as
https://crrev.com/4fd6cda06796e650d1ff65edf5dd08f3f1ae3223
Cr-Commit-Position: refs/heads/master@{#11374}

[pbos-webrtc, 2016-01-26 09:20:08]

Committed patchset #1 (id:1) manually as
4fd6cda06796e650d1ff65edf5dd08f3f1ae3223 (presubmit successful).