GitLab

minor changes
- print offset/mask info when printing layer hierarchy.
- copy the offset when cloning layer.

BUG=391822
TEST=Added new tests in layer_unittests and views_unittests

Review URL: https://codereview.chromium.org/375693006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283672 0039d316-1c4b-4281-b951-d872f2087c98