[Media, Video] Update WMPI when the pipeline gets a new average keyframe distance.

[Media, Video] Update WMPI when the pipeline gets a new average keyframe distance.

BUG=688618
TEST=manually followed the repro steps from the bug

Review-Url: https://codereview.chromium.org/2688383006
Cr-Commit-Position: refs/heads/master@{#450186}
(cherry picked from commit eecec52c10dffeebd35d273a8999388f98089b80)

Review-Url: https://codereview.chromium.org/2697123002 .
Cr-Commit-Position: refs/branch-heads/2987@{#529}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/6c5650f651734955ee5daa6a7c5e025cdca6e054

[whywhat, 2017-02-15 20:13:58]

Description was changed from

==========
[Media, Video] Update WMPI when the pipeline gets a new average keyframe
distance.

BUG=688618
TEST=manually followed the repro steps from the bug

Review-Url: https://codereview.chromium.org/2688383006
Cr-Commit-Position: refs/heads/master@{#450186}
(cherry picked from commit eecec52c10dffeebd35d273a8999388f98089b80)
==========

to

==========
[Media, Video] Update WMPI when the pipeline gets a new average keyframe
distance.

BUG=688618
TEST=manually followed the repro steps from the bug

Review-Url: https://codereview.chromium.org/2688383006
Cr-Commit-Position: refs/heads/master@{#450186}
(cherry picked from commit eecec52c10dffeebd35d273a8999388f98089b80)

Review-Url: https://codereview.chromium.org/2697123002 .
Cr-Commit-Position: refs/branch-heads/2987@{#529}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/6c5650f651734955ee5daa6a7c5e...
==========

[whywhat, 2017-02-15 20:13:59]

Committed patchset #1 (id:1) manually as
6c5650f651734955ee5daa6a7c5e025cdca6e054.