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 d36390b78ce22dce4feb07dc54b15b47bb07ced7..ff0c870c684746ed83cb7c9c0fb6d50d150dcfb3 100644
--- a/cc/layer_tree_host.h
+++ b/cc/layer_tree_host.h
@@ -93,7 +93,7 @@ struct RendererCapabilities {
 
 class CC_EXPORT LayerTreeHost : public RateLimiterClient {
 public:
-    static scoped_ptr<LayerTreeHost> create(LayerTreeHostClient*, const LayerTreeSettings&);
+    static scoped_ptr<LayerTreeHost> create(LayerTreeHostClient*, const LayerTreeSettings&, scoped_ptr<Thread> implThread);
     virtual ~LayerTreeHost();
 
     void setSurfaceReady();
@@ -212,9 +212,11 @@ public:
 
     HeadsUpDisplayLayer* hudLayer() const { return m_hudLayer.get(); }
 
+    Proxy* proxy() const { return m_proxy.get(); }
+
 protected:
     LayerTreeHost(LayerTreeHostClient*, const LayerTreeSettings&);
-    bool initialize();
+    bool initialize(scoped_ptr<Thread> implThread);
 
 private:
     typedef std::vector<scoped_refptr<Layer> > LayerList;
@@ -243,11 +245,11 @@ 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;