Adding GroupView. Moving NotificationButton and ProportionalImageView
out into their own files (no code change for them, just move)

BUG=320827

Review URL: https://codereview.chromium.org/86083002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240559 0039d316-1c4b-4281-b951-d872f2087c98
Fixes the shelf background while dragging a window

BUG=321704
TEST=ash_unittests --gtest_filter=*WorkspaceControllerTestDragging.DragWindowOverlapShelf*

Review URL: https://codereview.chromium.org/102493004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240560 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240560
Delay next sync when the last local-to-remote error had an error

BUG=none
TEST=LocalFileChangeTrackerTest.GetChanges

Review URL: https://codereview.chromium.org/98863003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240561 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240561
[Drive] Use ETag on Drive API file deletion.

BUG=240165

Review URL: https://codereview.chromium.org/102613005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240562 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240562