Add Web Animations API to bleeding edge fast path

Review URL: https://codereview.chromium.org/205803002

git-svn-id: svn://svn.chromium.org/blink/trunk@169896 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/web/WebRuntimeFeatures.cpp

@@ -49,6 +49,7 @@ void WebRuntimeFeatures::enableBleedingEdgeFastPaths(bool enable)
     RuntimeEnabledFeatures::setBleedingEdgeFastPathsEnabled(enable);
     RuntimeEnabledFeatures::setSubpixelFontScalingEnabled(enable || RuntimeEnabledFeatures::subpixelFontScalingEnabled());
     RuntimeEnabledFeatures::setCSSWillChangeEnabled(enable);
+    RuntimeEnabledFeatures::setWebAnimationsAPIEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableTestOnlyFeatures(bool enable)