Enable compositing for will-change GPU hints when hybrid rasterization is enabled
This enables compositing for will-change GPU rasterization hints when
hybrid GPU rasterization is enabled (that is, when running with
--enable-gpu-rasterization). Creating composited layers for such hints
only makes sense when using hybrid rasterization, since such hints are
otherwise ignored.
BUG=329722
Review URL: https://codereview.chromium.org/
197473002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256829 0039d316-1c4b-4281-b951-d872f2087c98