Get rid of two callsites of effect_tree.FindNodeIndexFromOwningLayerId.

cc/test/layer_test_common.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_LAYER_TEST_COMMON_H_
 #define CC_TEST_LAYER_TEST_COMMON_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 23 matching lines @@
 
 namespace gfx { class Rect; }
 
 namespace cc {
 class LayerImpl;
 class CompositorFrameSink;
 class QuadList;
 class RenderSurfaceImpl;
 class ResourceProvider;
 
+// Returns the RenderSurfaceImpl into which the given layer draws.
 RenderSurfaceImpl* GetRenderSurface(LayerImpl* layer_impl);
-const RenderSurfaceImpl* GetRenderSurface(const LayerImpl* layer_impl);
 
 class LayerTestCommon {
  public:
   static const char* quad_string;
 
   static void VerifyQuadsExactlyCoverRect(const QuadList& quads,
                                           const gfx::Rect& rect);
 
   static void VerifyQuadsAreOccluded(const QuadList& quads,
                                      const gfx::Rect& occluded,
@@ skipping 151 matching lines @@
     std::unique_ptr<RenderPass> render_pass_;
     scoped_refptr<AnimationTimeline> timeline_;
     scoped_refptr<AnimationTimeline> timeline_impl_;
     int layer_impl_id_;
   };
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_LAYER_TEST_COMMON_H_