Add a flag to enable remote CoreAnimation API.

A follow-on patch will switch this flag to be enabled by default.

BUG=312462
TBR=kbr
R=sky

Review URL: https://codereview.chromium.org/464063005

Cr-Commit-Position: refs/heads/master@{#289835}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289835 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed