Make Satisfy/Require callbacks pass Surface id and sequence by reference

cc/layers/surface_layer.h

 // Copyright 2014 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_LAYERS_SURFACE_LAYER_H_
 #define CC_LAYERS_SURFACE_LAYER_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_sequence.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 
 // A layer that renders a surface referencing the output of another compositor
 // instance or client.
 class CC_EXPORT SurfaceLayer : public Layer {
  public:
   // This callback is run when a SurfaceSequence needs to be satisfied, but
   // the parent compositor is unable to. It can be called on either the main
   // or impl threads.
-  using SatisfyCallback = base::Callback<void(SurfaceSequence)>;
+  using SatisfyCallback = base::Callback<void(const SurfaceSequence&)>;
 
   // This callback is run to require that a specific SurfaceSequence is
   // received before a SurfaceId is destroyed.
-  using RequireCallback = base::Callback<void(SurfaceId, SurfaceSequence)>;
+  using RequireCallback =
+      base::Callback<void(const SurfaceId&, const SurfaceSequence&)>;
 
   static scoped_refptr<SurfaceLayer> Create(
       const SatisfyCallback& satisfy_callback,
       const RequireCallback& require_callback);
 
   void SetSurfaceId(SurfaceId surface_id, float scale, const gfx::Size& size);
 
   // Layer overrides.
   std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
   void SetLayerTreeHost(LayerTreeHost* host) override;
@@ skipping 15 matching lines @@
   SurfaceSequence destroy_sequence_;
   SatisfyCallback satisfy_callback_;
   RequireCallback require_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_SURFACE_LAYER_H_