CSS Blending: Mix-blend-mode shouldn't force the creation of a composited layer.

cc/layers/layer_impl.cc

 // Copyright 2011 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 "cc/layers/layer_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/strings/stringprintf.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/scrollbar_animation_controller.h"
@@ skipping 1168 matching lines @@
 
   if (reasons & kCompositingReasonPositionFixed)
     reason_list->AppendString("Is fixed position");
 
   if (reasons & kCompositingReasonPositionSticky)
     reason_list->AppendString("Is sticky position");
 
   if (reasons & kCompositingReasonOverflowScrollingTouch)
     reason_list->AppendString("Is a scrollable overflow element");
 
-  if (reasons & kCompositingReasonBlending)
-    reason_list->AppendString("Has a blend mode");
-
   if (reasons & kCompositingReasonAssumedOverlap)
     reason_list->AppendString("Might overlap a composited animation");
 
   if (reasons & kCompositingReasonOverlap)
     reason_list->AppendString("Overlaps other composited content");
 
   if (reasons & kCompositingReasonNegativeZIndexChildren) {
     reason_list->AppendString("Might overlap negative z-index "
                               "composited content");
   }
@@ skipping 104 matching lines @@
 
 size_t LayerImpl::GPUMemoryUsageInBytes() const { return 0; }
 
 scoped_ptr<base::Value> LayerImpl::AsValue() const {
   scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
   AsValueInto(state.get());
   return state.PassAs<base::Value>();
 }
 
 }  // namespace cc