Remove the animation delay for showing the top level apps when user opens app list launcher. The animation will be performed only when user return to the top level apps grid view from a folder view.

BUG=336187

Review URL: https://codereview.chromium.org/163953008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251299 0039d316-1c4b-4281-b951-d872f2087c98
Remove hardcoded "Preferences" strings from app_list tests

R=tapted
BUG=343692

Review URL: https://codereview.chromium.org/164953003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251300 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251299
SVN changes up to revision 251300
Cast: Split kDuplicatePacketReceived into separate events for audio/video.

This change brings this type of event in line with the rest - having separate types
for audio / video. As a new type that is potentially sent over in RTCP is introduced,
a new RTCP encoding for that type is added as well.

This change is backwards-compatible because these events aren't being sent over in RTCP because they are not processed by ReceiverRtcpEventSubscriber.

BUG=337901

Review URL: https://codereview.chromium.org/164253003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251301 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251301