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 bdf5759d58bfdd1e2ef95c6f090a2c4b037e0406..fdc5f15377f331f14cf21e30e9e6ba5c7334226a 100644
--- a/cc/layer_tree_host.h
+++ b/cc/layer_tree_host.h
@@ -92,7 +92,7 @@ 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();
@@ -210,9 +210,11 @@ 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;
@@ -241,11 +243,11 @@ private:
     base::CancelableClosure m_prepaintCallback;
 
     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;