commit d82384e62af55a9aae1182b4ae4c19dac325910a
author ikilpatrick <ikilpatrick@chromium.org> Wed Aug 10 16:29:47 2016
committer Commit bot <commit-bot@chromium.org> Wed Aug 10 16:31:12 2016
tree 39bea2659c370d9d8867c8bd2d78b47fe7edc05f
parent 7025b343bb1a6bdf97242a09c10e6b0633a140f4

[worklets] Split apart CompositorWorkerThread for sharing with AnimationWorkletThread.

This splits apart CompositorWorkerThread into:
 - CompositorWorkerThread
 - AbstractAnimationWorkletThread

And add AnimationWorkletThread which inherits from AbstractAnimationWorkletThread.

AnimationWorkletThread is basically a place holder class at the moment
which needs createWorkerGlobalScope and consoleMessageStorage
implemented (which will be implemented once AnimationWorkletGS is
checked in).

BUG=567358

Review-Url: https://codereview.chromium.org/2214263007
Cr-Commit-Position: refs/heads/master@{#411052}