Add support for unprefixed CSS Transforms

Source/core/rendering/compositing/CompositingReasonFinder.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/rendering/compositing/CompositingReasonFinder.h"
 
 #include "CSSPropertyNames.h"
 #include "HTMLNames.h"
 #include "core/animation/ActiveAnimations.h"
@@ skipping 135 matching lines @@
 }
 
 bool CompositingReasonFinder::requiresCompositingForAnimation(RenderObject* renderer) const
 {
     if (!(m_compositingTriggers & AnimationTrigger))
         return false;
 
     return shouldCompositeForActiveAnimations(*renderer);
 }
 
+bool CompositingReasonFinder::requiresCompositingForTransition(RenderObject* renderer) const
+{
+    if (!(m_compositingTriggers & ChromeClient::AnimationTrigger))
+        return false;
+
+    if (Settings* settings = m_renderView.document().settings()) {
+        if (!settings->acceleratedCompositingForTransitionEnabled())
+            return false;
+    }
+
+    return renderer->style()->transitionForProperty(CSSPropertyOpacity)
+        || renderer->style()->transitionForProperty(CSSPropertyWebkitFilter)
+        || renderer->style()->transitionForProperty(CSSPropertyTransform)
+        || renderer->style()->transitionForProperty(CSSPropertyWebkitTransform);
+}
+
 bool CompositingReasonFinder::requiresCompositingForFilters(RenderObject* renderer) const
 {
     if (!(m_compositingTriggers & FilterTrigger))
         return false;
 
     return renderer->hasFilter();
 }
 
 bool CompositingReasonFinder::requiresCompositingForOverflowScrollingParent(const RenderLayer* layer) const
 {
@@ skipping 135 matching lines @@
 
     return true;
 }
 
 bool CompositingReasonFinder::requiresCompositingForOverflowScrolling(const RenderLayer* layer) const
 {
     return layer->needsCompositedScrolling();
 }
 
 }