Add support for unprefixed CSS Transforms

Source/core/rendering/compositing/CompositingReasonFinder.cpp

Index: Source/core/rendering/compositing/CompositingReasonFinder.cpp
diff --git a/Source/core/rendering/compositing/CompositingReasonFinder.cpp b/Source/core/rendering/compositing/CompositingReasonFinder.cpp
index 6f9ae626c35aa7cd735e75bf78d1f9c5a653df8d..ec2eadd7ad4066e9242829b05d28d1ef01f19b64 100644
--- a/Source/core/rendering/compositing/CompositingReasonFinder.cpp
+++ b/Source/core/rendering/compositing/CompositingReasonFinder.cpp
@@ -153,6 +153,22 @@ bool CompositingReasonFinder::requiresCompositingForAnimation(RenderObject* rend
     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))