Fix border radius on composited children.

third_party/WebKit/Source/platform/graphics/CompositingReasons.h

Index: third_party/WebKit/Source/platform/graphics/CompositingReasons.h
diff --git a/third_party/WebKit/Source/platform/graphics/CompositingReasons.h b/third_party/WebKit/Source/platform/graphics/CompositingReasons.h
index 48e61eaae7df41195edf081bd6151968e7205b1f..4d731230afb28f639e1bdda93dd73eb2d245c1fc 100644
--- a/third_party/WebKit/Source/platform/graphics/CompositingReasons.h
+++ b/third_party/WebKit/Source/platform/graphics/CompositingReasons.h
@@ -72,12 +72,13 @@ const uint64_t CompositingReasonLayerForBackground                       = UINT6
 const uint64_t CompositingReasonLayerForMask                             = UINT64_C(1) << 45;
 const uint64_t CompositingReasonLayerForClippingMask                     = UINT64_C(1) << 46;
 const uint64_t CompositingReasonLayerForScrollingBlockSelection          = UINT64_C(1) << 47;
+const uint64_t CompositingReasonLayerForAncestorClippingMask             = UINT64_C(1) << 48;
 
 // Composited elements with inline transforms trigger assumed overlap so that
 // we can update their transforms quickly.
-const uint64_t CompositingReasonInlineTransform                          = UINT64_C(1) << 48;
+const uint64_t CompositingReasonInlineTransform                          = UINT64_C(1) << 49;
 
-const uint64_t CompositingReasonCompositorProxy                          = UINT64_C(1) << 49;
+const uint64_t CompositingReasonCompositorProxy                          = UINT64_C(1) << 50;
 
 // Various combinations of compositing reasons are defined here also, for more intutive and faster bitwise logic.
 const uint64_t CompositingReasonComboAllDirectReasons =