cc: Remove most methods from RendererClient.

cc/output/output_surface.h

Index: cc/output/output_surface.h
diff --git a/cc/output/output_surface.h b/cc/output/output_surface.h
index 84d128aa023b7dd7c3c25fe5b2ce36e3dd8951be..c01c7688608d6b06412086146676ce71c6576182 100644
--- a/cc/output/output_surface.h
+++ b/cc/output/output_surface.h
@@ -73,6 +73,8 @@ class CC_EXPORT OutputSurface : public FrameRateControllerClient {
     return capabilities_;
   }
 
+  virtual bool HasExternalStencilTest() const;
+
   // Obtain the 3d context or the software device associated with this output
   // surface. Either of these may return a null pointer, but not both.
   // In the event of a lost context, the entire output surface should be
@@ -194,6 +196,8 @@ class CC_EXPORT OutputSurface : public FrameRateControllerClient {
   // redundant checks for a retroactive BeginFrame.
   bool check_for_retroactive_begin_frame_pending_;
 
+  bool external_stencil_test_enabled_;
+
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };