[Mac] Draw accelerated underlay view immediately instead of marking for display.

BUG=344365

Review URL: https://codereview.chromium.org/169813002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252674 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252674