cc: Don't pass simple well-defined classes by reference.

cc/test/fake_proxy.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_FAKE_PROXY_H_
 #define CC_TEST_FAKE_PROXY_H_
 
 #include "cc/base/thread.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/proxy.h"
 
 namespace cc {
 
 class FakeProxy : public Proxy {
  public:
   explicit FakeProxy(scoped_ptr<Thread> impl_thread)
       : Proxy(impl_thread.Pass()) {}
 
   virtual bool CompositeAndReadback(void* pixels, gfx::Rect rect) OVERRIDE;
   virtual void FinishAllRendering() OVERRIDE {}
   virtual bool IsStarted() const OVERRIDE;
   virtual bool InitializeOutputSurface() OVERRIDE;
   virtual void SetSurfaceReady() OVERRIDE {}
   virtual void SetVisible(bool visible) OVERRIDE {}
   virtual bool InitializeRenderer() OVERRIDE;
   virtual bool RecreateOutputSurface() OVERRIDE;
   virtual const RendererCapabilities& GetRendererCapabilities() const OVERRIDE;
   virtual void SetNeedsAnimate() OVERRIDE {}
   virtual void SetNeedsCommit() OVERRIDE {}
-  virtual void SetNeedsRedraw(const gfx::Rect& damage_rect) OVERRIDE {}
+  virtual void SetNeedsRedraw(gfx::Rect damage_rect) OVERRIDE {}
   virtual void SetDeferCommits(bool defer_commits) OVERRIDE {}
   virtual void MainThreadHasStoppedFlinging() OVERRIDE {}
   virtual bool CommitRequested() const OVERRIDE;
   virtual void Start() OVERRIDE {}
   virtual void Stop() OVERRIDE {}
   virtual void ForceSerializeOnSwapBuffers() OVERRIDE {}
   virtual size_t MaxPartialTextureUpdates() const OVERRIDE;
   virtual void AcquireLayerTextures() OVERRIDE {}
   virtual bool CommitPendingForTesting() OVERRIDE;
   virtual skia::RefPtr<SkPicture> CapturePicture() OVERRIDE;
   virtual scoped_ptr<base::Value> AsValue() const OVERRIDE;
 
   virtual RendererCapabilities& GetRendererCapabilities();
   void SetMaxPartialTextureUpdates(size_t max);
 
  private:
   RendererCapabilities capabilities_;
   size_t max_partial_texture_updates_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PROXY_H_