Add CCDelegatingRenderer, and corresponding IPCs

cc/CCDelegatedRendererLayerImpl.h

Index: cc/CCDelegatedRendererLayerImpl.h
diff --git a/cc/CCDelegatedRendererLayerImpl.h b/cc/CCDelegatedRendererLayerImpl.h
index 7203fafd04e7767ba31229f6d5df1a8f2ae06b08..b3f81046713a5ef8510fda45dff12f3397f07b08 100644
--- a/cc/CCDelegatedRendererLayerImpl.h
+++ b/cc/CCDelegatedRendererLayerImpl.h
@@ -30,6 +30,9 @@ public:
     void appendContributingRenderPasses(CCRenderPassSink&);
     virtual void appendQuads(CCQuadSink&, CCAppendQuadsData&) OVERRIDE;
 
+    void createChild();
+    int childId() const { return m_childId; }
+
 private:
     explicit CCDelegatedRendererLayerImpl(int);
 
@@ -40,9 +43,11 @@ private:
     PassOwnPtr<CCDrawQuad> createCopyOfQuad(const CCDrawQuad*);
 
     virtual const char* layerTypeAsString() const OVERRIDE;
+    void clearChild();
 
     ScopedPtrVector<CCRenderPass> m_renderPassesInDrawOrder;
     base::hash_map<CCRenderPass::Id, int> m_renderPassesIndexById;
+    int m_childId;
 };
 
 }