Disable ubercomp for kiosk mode.

This is a short term workaround. Will revert promptly.

BUG=342061
TEST=launch app in kiosk mode and make sure things are still working, and RenderWidget::CreateOutputSurface() does not allocate DelegatedCompositorOutputSurface.
R=xiyuan@chromium.org

Review URL: https://codereview.chromium.org/164683002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251146 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251146
Cast: Rtcp and RtcpSender don't take event logs

This is the first change to allow RtcpSender to send redundant events.
Rtcp and RtcpSender interface used to accept receiver events logs. They
are now changed to accept ReceiverRtcpEventSubscriber. This allows
RtcpSender to fetch event logs from the subscriber directly.

No functional change other than passing event subscriber instead of
event logs.

Review URL: https://codereview.chromium.org/162333002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251147 0039d316-1c4b-4281-b951-d872f2087c98
Add test for ChromeVox injection into webview

TEST=browser_tests
BUG=342546

Review URL: https://codereview.chromium.org/153263006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251148 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251147
Disable flaky test

Flakily fails: MSE_ClearKey/EncryptedMediaTest.ConfigChangeVideo/0

NOTRY=true
TBR=yfriedman
BUG=343604

Review URL: https://codereview.chromium.org/163503003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251149 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251148
SVN changes up to revision 251149