Initialize TracingModel.EventBindings in one pass

BUG=361045

Review URL: https://codereview.chromium.org/284313013

git-svn-id: svn://svn.chromium.org/blink/trunk@174510 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Use transition types for HTMLElement.

BUG=357163
R=haraken@chromium.org

Review URL: https://codereview.chromium.org/292813004

git-svn-id: svn://svn.chromium.org/blink/trunk@174511 bbb929c8-8fbe-4397-9dbb-9b2b20218538