Use DEFINE_CSS_VALUE_TYPE_CASTS() for SVGColor, SVGPaint, and TextCloneCSSValue

SVGColor, SVGPaint and TextCloneCSSValue don't use DEFINE_CSS_VALUE_TYPE_CASTS() yet. It will help to detect bad type casts.


BUG=N/A

Review URL: https://codereview.chromium.org/27183005

git-svn-id: svn://svn.chromium.org/blink/trunk@160045 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Web Animations: Introduce an API for threaded animation.

BUG=

Review URL: https://codereview.chromium.org/28293002

git-svn-id: svn://svn.chromium.org/blink/trunk@160046 bbb929c8-8fbe-4397-9dbb-9b2b20218538