Fix border radius on composited children.

third_party/WebKit/Source/platform/graphics/CompositingReasons.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 "platform/graphics/CompositingReasons.h"
 
 #include "wtf/StdLibExtras.h"
 
 namespace blink {
 
@@ skipping 141 matching lines @@
         "Secondary layer, to contain acceleratable background content" },
     { CompositingReasonLayerForMask,
         "layerForMask",
         "Secondary layer, to contain the mask contents" },
     { CompositingReasonLayerForClippingMask,
         "layerForClippingMask",
         "Secondary layer, for clipping mask" },
     { CompositingReasonLayerForScrollingBlockSelection,
         "layerForScrollingBlockSelection",
         "Secondary layer, to house block selection gaps for composited scrolling with no scrolling contents" },
+    { CompositingReasonLayerForAncestorClippingMask,
+        "layerForAncestorClippingMask",
+        "Secondary layer, applies a clipping mask due to a sibling in the compositing tree" },
     { CompositingReasonInlineTransform,
         "inlineTransform",
         "Has an inline transform, which causes subsequent layers to assume overlap" },
 };
 
 const size_t kNumberOfCompositingReasons = WTF_ARRAY_LENGTH(kCompositingReasonStringMap);
 
 } // namespace blink