Pass in ScriptState to V8EventListenerList::getEventListener()

- This CL removes Isolate::GetCurrent() from getEventListener().
- This CL removes an empty-context check from getEventListener(), because getEventListener() is always called from the binding code and thus the context shouldn't be empty.

BUG=357144

Review URL: https://codereview.chromium.org/291573005

git-svn-id: svn://svn.chromium.org/blink/trunk@174250 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Web Animations: Allow CSS Animations to start before load and remove TransitionTimeline

The CSSWG resolved[1] to remove the requirement that CSS Animations do not start
before load. This allows CSS Animations and Transitions to have the same start
requirements and negates the need for the separate TransitionTimeline.

[1] http://lists.w3.org/Archives/Public/www-style/2014Jan/0606.html

Review URL: https://codereview.chromium.org/270213005

git-svn-id: svn://svn.chromium.org/blink/trunk@174251 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Increase the number of rebaselines that we do back up to 200.

We decreased it to 50 because too many uploads were failing,
but codereview.chromium.org has gotten more reliable since
then. So lets try 200 again to avoid spamming the repository
with so many commits.

TBR=dpranke@chromium.org

Review URL: https://codereview.chromium.org/282303011

git-svn-id: svn://svn.chromium.org/blink/trunk@174252 bbb929c8-8fbe-4397-9dbb-9b2b20218538