cc: Initialize PageScaleAnimation's start time on first animation

This removes the possibility that creating a PageScaleAnimation
will initialize the animation time before the BeginFrame on the
impl thread arrives, introducing unwanted jitter.

BUG=297631

Review URL: https://codereview.chromium.org/24502002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225487 0039d316-1c4b-4281-b951-d872f2087c98
Support CopyOrMoveOption on Drive File System.

This CL starts to support CopyOrMoveOption on DriveFileSystem's AsyncFileUtil.
This will be used for Files.app's copyTo.

BUG=282107
TEST=Ran unit_tests

Review URL: https://codereview.chromium.org/24532002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225488 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225488
Fix typo in mock_timer.js.

BUG=NONE
R=bshe@chromium.org

Review URL: https://codereview.chromium.org/23464109

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225489 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225489