The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6468142875bd0d0b1064965e82c4b04747cac2fd

commit 6468142875bd0d0b1064965e82c4b04747cac2fd
Author: emircan <emircan@chromium.org>
Date: Fri May 13 18:52:38 2016

Use kEnableWebRtcHWH264Encoding flag when SW fallback is available

HW H264 encoding was only enabled on extensions so far through
the use of kEnableWebRtcHWH264Encoding flag. This CL attaches
kEnableWebRtcHWH264Encoding when kWebRtcH264WithOpenH264FFmpeg
is available. As a result, HW H264 encoding would be enabled on
every supported platform where SW H264 fallback is also available.

BUG= 611574 

Review-Url: https://codereview.chromium.org/1972333002
Cr-Commit-Position: refs/heads/master@{#393593}

[modify] https://crrev.com/6468142875bd0d0b1064965e82c4b04747cac2fd/content/renderer/media/rtc_video_encoder_factory.cc

Opening this again as the above CL got reverted.

Moving this nonessential bug to the next milestone.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ffaecc8ff3be5cdd883e5a51b19acc04cb40a4b4

commit ffaecc8ff3be5cdd883e5a51b19acc04cb40a4b4
Author: emircan <emircan@chromium.org>
Date: Thu Jul 07 18:27:03 2016

Reland "Use kEnableWebRtcHWH264Encoding flag when SW fallback is available"

This CL relands the below patch to enable HW H264 encoding on
every supported platform.
It was originally reverted while fixing ChromeOS issues listed
below. Kernel fixes for these have landed.

https://bugs.chromium.org/p/chromium/issues/detail?id=615272
https://bugs.chromium.org/p/chromium/issues/detail?id=625073#c3

BUG= 611574 ,625073
TEST=Test AppRTC loopback on
https://apprtc.appspot.com/?debug=loopback&vsc=h264
with flag enable-webrtc-h264-with-openh264-ffmpeg enabled.

Original CL description:
https://codereview.chromium.org/1972333002

Use kEnableWebRtcHWH264Encoding flag when SW fallback is available

HW H264 encoding was only enabled on extensions so far through
the use of kEnableWebRtcHWH264Encoding flag. This CL attaches
kEnableWebRtcHWH264Encoding when kWebRtcH264WithOpenH264FFmpeg
is available. As a result, HW H264 encoding would be enabled on
every supported platform where SW H264 fallback is also available.

Review-Url: https://codereview.chromium.org/2125163003
Cr-Commit-Position: refs/heads/master@{#404184}

[modify] https://crrev.com/ffaecc8ff3be5cdd883e5a51b19acc04cb40a4b4/content/renderer/media/gpu/rtc_video_encoder_factory.cc

This issue is Pri-1 but has already been moved once. Lowering the priority and moving to the next milestone.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

emircan@ can you confirm that this is fixed and is landed in M53? If so, please update the milestone label.

This feature for Chromium on CrOS landed for 54(See comment 6), so I will mark it as fixed. We came across to some issues regarding CrOS kernel on testing with 53, for which a fix landed https://bugs.chromium.org/p/chromium/issues/detail?id=625073#c3.

wuchengli@, would the kernel fix you mentioned above make it to CrOS when Chromium M53 rolls. I am not clear on how CrOS and Chromium branch timelines work. If the kernel fix makes it to M53, I can merge the CL on comment 6 back to M-53. 

M53 has the fix for nyan. So you can merge the CL to M53 if you want. I'm not sure the risk of merging. Almost all CrOS have H264 HW encode so it will affect all CrOS. What is the use case of enabling H264 HW encode from end user's perspective? It only affects the extensions and apps that use pepper VideoEncodeAccelerator API?

Ping.

I don't think we should re-enable WebRTC HW H264 for 53, it's too risky at this point. Still this is issue fixed by disabling HW encode for 53.

As it stands, WebRTC CrOS will have SW H264 for M53 and HW H264 for M54+. 

Re 310, extensions have HW H264 enabled already. The difference would be only for WebRTC using HW encoders. Currently it is disabled for M53.