Drop "only composite opacity animations when already in compositing mode".

Source/core/animation/ActiveAnimations.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #include "config.h"
 #include "core/animation/ActiveAnimations.h"
 
 #include "core/frame/animation/AnimationController.h"
 #include "core/rendering/RenderObject.h"
 
 namespace WebCore {
 
-bool shouldCompositeForActiveAnimations(const RenderObject& renderer, bool renderViewInCompositingMode)
+bool shouldCompositeForActiveAnimations(const RenderObject& renderer)
 {
     ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled());
 
     if (!renderer.node() || !renderer.node()->isElementNode())
         return false;
 
     const Element* element = toElement(renderer.node());
     if (const ActiveAnimations* activeAnimations = element->activeAnimations()) {
-        // FIXME: remove compositing mode check once compositing is forced on all platforms
-        if ((renderViewInCompositingMode && activeAnimations->hasActiveAnimations(CSSPropertyOpacity))
+        if (activeAnimations->hasActiveAnimations(CSSPropertyOpacity)
             || activeAnimations->hasActiveAnimations(CSSPropertyWebkitTransform)
             || activeAnimations->hasActiveAnimations(CSSPropertyWebkitFilter))
             return true;
     }
 
     return false;
 }
 
 bool hasActiveAnimations(const RenderObject& renderer, CSSPropertyID property)
 {
@@ skipping 33 matching lines @@
     return m_defaultStack.hasActiveAnimationsOnCompositor(property);
 }
 
 void ActiveAnimations::cancelAnimationOnCompositor()
 {
     for (PlayerSet::iterator it = m_players.begin(); it != players().end(); ++it)
         it->key->cancelAnimationOnCompositor();
 }
 
 } // namespace WebCore