Do not enforce one PTS/DTS pair for each video PES packet.

Having a PTS/DTS per video PES packet is just an HLS recommendation.
Some streams do not comply with this recommendation.
The most important is to have some timings for each access unit
and this criteria is still enforced in this H264 parser.

These 2 criteria are different when an access unit spans over
several PES packets (let's say N PES packets). In this case,
the timings in PES packets from idx 2 to idx N-1 are irrelevant.

BUG=None

Review URL: https://codereview.chromium.org/193063003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256697 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256697
Change top-level PRESUBMIT to support split tryserver

This also fixes problems with generic trybots not being triggered
when other presubmit files which already support multiple masters
get in scope.

BUG=334892
R=maruel@chromium.org

Review URL: https://codereview.chromium.org/197963003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256698 0039d316-1c4b-4281-b951-d872f2087c98
Revert 255846 "MediaStream VideoTrack implementation."

This is causing problems in the video stream when audio devices 
(input or output) is switched.

BUG=351949,334241

> MediaStream VideoTrack implementation.
> This implementation only use Chrome video classes for local rendering.
> A libjingle representation is created once its connected to a PeerConnection.
> 
> 
> BUG=334241
> 
> Review URL: https://codereview.chromium.org/155853002

TBR=perkj@chromium.org

Review URL: https://codereview.chromium.org/198353002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256699 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256698
SVN changes up to revision 256699