Constrain transform animation direct compositing reason to transforms.

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

 // Copyright 2015 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 "core/paint/PaintPropertyTreeBuilder.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutInline.h"
@@ skipping 301 matching lines @@
     context.current.renderingContextID = 0;
   }
 }
 
 static CompositingReasons compositingReasonsForTransform(
     const LayoutObject& object) {
   CompositingReasons compositingReasons = CompositingReasonNone;
   if (CompositingReasonFinder::requiresCompositingForTransform(object))
     compositingReasons |= CompositingReason3DTransform;
 
-  if (CompositingReasonFinder::requiresCompositingForAnimation(
+  if (CompositingReasonFinder::requiresCompositingForTransformAnimation(
           object.styleRef()))
     compositingReasons |= CompositingReasonActiveAnimation;
 
   if (object.styleRef().hasWillChangeCompositingHint() &&
       !object.styleRef().subtreeWillChangeContents())
     compositingReasons |= CompositingReasonWillChangeCompositingHint;
 
   return compositingReasons;
 }
 
@@ skipping 630 matching lines @@
   updateOverflowClip(object, context);
   updatePerspective(object, context);
   updateSvgLocalToBorderBoxTransform(object, context);
   updateScrollAndScrollTranslation(object, context);
   updateOutOfFlowContext(object, context);
 
   context.forceSubtreeUpdate |= object.subtreeNeedsPaintPropertyUpdate();
 }
 
 }  // namespace blink