Add an API to report debugName in GraphicsLayer

Source/WebKit/chromium/src/PageOverlay.cpp

Index: Source/WebKit/chromium/src/PageOverlay.cpp
diff --git a/Source/WebKit/chromium/src/PageOverlay.cpp b/Source/WebKit/chromium/src/PageOverlay.cpp
index c0e7911c527077f6193993a27cdefd1733f98f71..eebeeb78fa49ccbdb0857d51e8c32297c5b60042 100644
--- a/Source/WebKit/chromium/src/PageOverlay.cpp
+++ b/Source/WebKit/chromium/src/PageOverlay.cpp
@@ -81,6 +81,11 @@ public:
         gc.restore();
     }
 
+    virtual String debugName(const GraphicsLayer*) OVERRIDE
+    {
+        return String("WebViewImpl Page Overlay Content Layer");

[enne (OOO), 2013/07/30 17:31:05]

Can you ASSERT that layer here is m_layer?

[qiankun, 2013/07/31 11:16:28]

Done. 
1. There is no m_layer member in OverlayGraphicsLayerClientImpl. I added
"createGraphicsLayer()" to create and return m_layer in
OverlayGraphicsLayerClientImpl. 
2. The OverlayGraphicsLayerClientImpl class is moved to PageOverlay.h file. 
3. Changed "OwnPtr<WebCore::GraphicsLayerClient> m_layerClient;" to 
"OwnPtr<OverlayGraphicsLayerClientImpl> m_layerClient;". This is for calling
createGraphicsLayer() which is not a member function of
"WebCore::GraphicsLayerClient".

+    }
+
 private:
     explicit OverlayGraphicsLayerClientImpl(WebPageOverlay* overlay)
         : m_overlay(overlay)
@@ -108,7 +113,6 @@ void PageOverlay::update()
     if (!m_layer) {
         m_layerClient = OverlayGraphicsLayerClientImpl::create(m_overlay);
         m_layer = GraphicsLayer::create(m_viewImpl->graphicsLayerFactory(), m_layerClient.get());
-        m_layer->setName("WebViewImpl page overlay content");
         m_layer->setDrawsContent(true);
     }