Fixed the "Local source provicer FIFO is full" log spamming.

The problem is that when CreateMediaStreamSource(stream) is called by multiple times, the WebAudio will get data from the new source provider, but will not notify the old source provider on the change, and our media streamaudio track still provide data to the old source providers, which will make the FIFO full since there is no consumer.

BUG=343842

Review URL: https://codereview.chromium.org/177483003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253864 0039d316-1c4b-4281-b951-d872f2087c98
Restructure RawChannelPosix and RawChannel, so that the platform-independent logic can be shared between POSIX and Windows.

BUG=None
TEST=mojo_system_unittests
R=viettrungluu@chromium.org

Review URL: https://codereview.chromium.org/169723004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253865 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253865
[Android WebView] Disable AwContentsClientShouldInterceptRequestTest.testCalledForImage

Seems to be flaky. Reproducible locally.

BUG=347599
NOTRY=true
R=boliu@chromium.org

Review URL: https://codereview.chromium.org/183503003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253866 0039d316-1c4b-4281-b951-d872f2087c98
Update presubmit default trybots to be more similar to CQ config

BUG=317931
R=maruel@chromium.org

Review URL: https://codereview.chromium.org/179453003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253867 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253867
Adjust before/after times to compensate for storage inaccuracies.

BUG=346827

Review URL: https://codereview.chromium.org/178343009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253868 0039d316-1c4b-4281-b951-d872f2087c98
Mojo: Add hooks for dispatchers to serialize themselves.

R=yzshen@chromium.org

Review URL: https://codereview.chromium.org/182163002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253869 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253869