cc: Route offscreen context creation for compositor to the browser.

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 a45c1c1ee1e1941313d8b85a4c1bfaad51a9fd0f..059989d191d6c6d48a6a7dbec99c675d0c0d4b6c 100644
--- a/cc/layer_tree_host.h
+++ b/cc/layer_tree_host.h
@@ -82,9 +82,8 @@ public:
     // Returns true if any LayerTreeHost is alive.
     static bool anyLayerTreeHostInstanceExists();
 
-    static bool needsFilterContext() { return s_needsFilterContext; }
-    static void setNeedsFilterContext(bool needsFilterContext) { s_needsFilterContext = needsFilterContext; }
-    bool needsSharedContext() const { return needsFilterContext() || settings().acceleratePainting; }
+    void setNeedsFilterContext() { m_needsFilterContext = true; }
+    bool needsOffscreenContext() const { return m_needsFilterContext || settings().acceleratePainting; }
 
     // LayerTreeHost interface to Proxy.
     void willBeginFrame() { m_client->willBeginFrame(); }
@@ -229,6 +228,7 @@ private:
 
     bool m_animating;
     bool m_needsFullTreeSync;
+    bool m_needsFilterContext;
 
     base::CancelableClosure m_prepaintCallback;
 
@@ -273,8 +273,6 @@ private:
 
     scoped_ptr<AnimationRegistrar> m_animationRegistrar;
 
-    static bool s_needsFilterContext;
-
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };