Remove static thread pointers from CC

cc/layer_tree_host.h

Index: cc/layer_tree_host.h
diff --git a/cc/layer_tree_host.h b/cc/layer_tree_host.h
index 1f589525ba007a67e3f70bf5a00ce7e617d44cca..957066e2f4bca85b27b1de6f6b4a970e02ce343f 100644
--- a/cc/layer_tree_host.h
+++ b/cc/layer_tree_host.h
@@ -90,7 +90,7 @@ struct RendererCapabilities {
 
 class LayerTreeHost : public RateLimiterClient {
 public:
-    static scoped_ptr<LayerTreeHost> create(LayerTreeHostClient*, const LayerTreeSettings&);
+    static scoped_ptr<LayerTreeHost> create(LayerTreeHostClient*, const LayerTreeSettings&, Thread* implThread);
     virtual ~LayerTreeHost();
 
     void setSurfaceReady();
@@ -204,9 +204,11 @@ public:
 
     HeadsUpDisplayLayer* hudLayer() const { return m_hudLayer.get(); }
 
+    Proxy* proxy() const { return m_proxy.get(); }
+
 protected:
     LayerTreeHost(LayerTreeHostClient*, const LayerTreeSettings&);
-    bool initialize();
+    bool initialize(Thread* implThread);
 
 private:
     typedef std::vector<scoped_refptr<Layer> > LayerList;
@@ -232,11 +234,11 @@ private:
     bool m_needsAnimateLayers;
 
     LayerTreeHostClient* m_client;
+    scoped_ptr<Proxy> m_proxy;
 
     int m_commitNumber;
     RenderingStats m_renderingStats;
 
-    scoped_ptr<Proxy> m_proxy;
     bool m_rendererInitialized;
     bool m_contextLost;
     int m_numTimesRecreateShouldFail;