GitLab

When impl-side painting, we draw when the pending tree
becomes active and should no longer draw on commit.

BUG=168724

Review URL: https://chromiumcodereview.appspot.com/11830040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@177274 0039d316-1c4b-4281-b951-d872f2087c98