Change content view switching animation for experimental app launcher.

This CL implements a different animation for the experimental app list.
The change will allow more views to be added with a default animation
when switching the contents view.

BUG=349727

Review URL: https://codereview.chromium.org/187083004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255812 0039d316-1c4b-4281-b951-d872f2087c98
chromeos: A little more cleanup for EventRewriter.

The EventRewriter itself is a MessagePumpObserver now, so it does not have
to depend on XInputHierarchyChangedEventListener to know what device a key
event came from. Remove the relevant method from DeviceHierarchyObserver
interface.

BUG=none
R=derat@chromium.org

Review URL: https://codereview.chromium.org/192123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255813 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255813
Handle has_more correctly in DeveloperPrivateLoadDirectoryFunction

BUG=347900

Review URL: https://codereview.chromium.org/190203003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255814 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255814