Adds DevTools commands for forced viewport override.

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 932 matching lines @@
     if (m_renderingContext3d == context)
         return;
 
     m_renderingContext3d = context;
     m_layer->layer()->setRenderingContext(context);
 
     if (m_contentsLayer)
         m_contentsLayer->setRenderingContext(m_renderingContext3d);
 }
 
+bool GraphicsLayer::masksToBounds() const
+{
+    return m_layer->layer()->masksToBounds();
+}
+
 void GraphicsLayer::setMasksToBounds(bool masksToBounds)
 {
     m_layer->layer()->setMasksToBounds(masksToBounds);
 }
 
 void GraphicsLayer::setDrawsContent(bool drawsContent)
 {
     // Note carefully this early-exit is only correct because we also properly call
     // WebLayer::setDrawsContent whenever m_contentsLayer is set to a new layer in setupContentsLayer().
     if (drawsContent == m_drawsContent)
@@ skipping 388 matching lines @@
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif