[Media] Add a finch trial param for background MediaSource videos

[Media] Add a finch trial param for background MediaSource videos

Added a new finch trial parameter to set the max average keyframe
distance that allows disabling of the video track or pausing
MediaSource videos when in the background.
WMPI now uses the right parameter according to the |load_type_|.
Parametrized unit tests test for both load types.

BUG=663999
TEST=unittests+manual

Review-Url: https://codereview.chromium.org/2818823002
Cr-Commit-Position: refs/heads/master@{#464619}
Committed: https://chromium.googlesource.com/chromium/src/+/e85ec428376cf7d6f281ace33f1a8b440dc601c3

[whywhat, 2017-04-13 20:57:15]

avayvod@chromium.org changed reviewers:
+ dalecurtis@chromium.org, jam@chromium.org

[whywhat, 2017-04-13 20:57:15]

PTaL

[DaleCurtis, 2017-04-13 21:26:29]

lgtm

[whywhat, 2017-04-13 21:54:56]

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

[commit-bot: I haz the power, 2017-04-13 21:55:53]

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

[jam, 2017-04-13 23:12:35]

content lgtm

[commit-bot: I haz the power, 2017-04-13 23:55:34]

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

[commit-bot: I haz the power, 2017-04-13 23:55:35]

Dry run: This issue passed the CQ dry run.

[whywhat, 2017-04-14 00:03:33]

The CQ bit was checked by avayvod@chromium.org

[commit-bot: I haz the power, 2017-04-14 00:04:19]

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, 2017-04-14 00:11:37]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1492128213309340, "parent_rev":
"e5a158db9c3a0720c8390fc89df447b1b52d3d0f", "commit_rev":
"e85ec428376cf7d6f281ace33f1a8b440dc601c3"}

[commit-bot: I haz the power, 2017-04-14 00:13:12]

Description was changed from

==========
[Media] Add a finch trial param for background MediaSource videos

Added a new finch trial parameter to set the max average keyframe
distance that allows disabling of the video track or pausing
MediaSource videos when in the background.
WMPI now uses the right parameter according to the |load_type_|.
Parametrized unit tests test for both load types.

BUG=663999
TEST=unittests+manual
==========

to

==========
[Media] Add a finch trial param for background MediaSource videos

Added a new finch trial parameter to set the max average keyframe
distance that allows disabling of the video track or pausing
MediaSource videos when in the background.
WMPI now uses the right parameter according to the |load_type_|.
Parametrized unit tests test for both load types.

BUG=663999
TEST=unittests+manual

Review-Url: https://codereview.chromium.org/2818823002
Cr-Commit-Position: refs/heads/master@{#464619}
Committed:
https://chromium.googlesource.com/chromium/src/+/e85ec428376cf7d6f281ace33f1a...
==========

[commit-bot: I haz the power, 2017-04-14 00:13:14]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/e85ec428376cf7d6f281ace33f1a...