Re-land of issue 200623006: Set geometry dirty bits on composited layer mappings w/squashing

Adds test expectation fix.

BUG=

Review URL: https://codereview.chromium.org/204983002

git-svn-id: svn://svn.chromium.org/blink/trunk@169608 bbb929c8-8fbe-4397-9dbb-9b2b20218538