Plumb border radius through when computing clip visual rects.

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

Index: third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
diff --git a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
index 5514ca0ce99c92270b580bfba02de414058c60a4..0152a5f831c0c4a00c0f49e87b967f96b30b8d18 100644
--- a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
+++ b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
@@ -121,8 +121,10 @@ ClipRect PrePaintTreeWalk::clipRectForContext(
   // TODO(chrishtr): remove need for this.
   LayoutRect localRect(LayoutRect::infiniteIntRect());
 
-  LayoutRect rect(m_geometryMapper.sourceToDestinationVisualRect(
-      FloatRect(localRect), localState, ancestorState));
+  LayoutRect rect(m_geometryMapper
+                      .sourceToDestinationVisualRect(FloatRect(localRect),
+                                                     localState, ancestorState)
+                      .rect());
   rect.moveBy(-ancestorPaintOffset);
   return rect;
 }