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

cc/trees/thread_proxy.h

 // Copyright 2011 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_TREES_THREAD_PROXY_H_
 #define CC_TREES_THREAD_PROXY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
@@ skipping 31 matching lines @@
   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 bool CommitRequested() const OVERRIDE;
   virtual void MainThreadHasStoppedFlinging() OVERRIDE;
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual size_t MaxPartialTextureUpdates() const OVERRIDE;
   virtual void AcquireLayerTextures() OVERRIDE;
   virtual void ForceSerializeOnSwapBuffers() OVERRIDE;
   virtual skia::RefPtr<SkPicture> CapturePicture() OVERRIDE;
   virtual scoped_ptr<base::Value> AsValue() const OVERRIDE;
@@ skipping 94 matching lines @@
                                   InputHandler* input_handler);
   void SetSurfaceReadyOnImplThread();
   void SetVisibleOnImplThread(CompletionEvent* completion, bool visible);
   void InitializeOutputSurfaceOnImplThread(
       scoped_ptr<OutputSurface> output_surface);
   void InitializeRendererOnImplThread(CompletionEvent* completion,
                                       bool* initialize_succeeded,
                                       RendererCapabilities* capabilities);
   void LayerTreeHostClosedOnImplThread(CompletionEvent* completion);
   void ManageTilesOnImplThread();
-  void SetViewportDamageOnImplThread(const gfx::Rect& damage_rect);
+  void SetViewportDamageOnImplThread(gfx::Rect damage_rect);
   void AcquireLayerTexturesForMainThreadOnImplThread(
       CompletionEvent* completion);
   void RecreateOutputSurfaceOnImplThread(
       CompletionEvent* completion,
       scoped_ptr<OutputSurface> output_surface,
       scoped_refptr<cc::ContextProvider> offscreen_context_provider,
       bool* recreate_succeeded,
       RendererCapabilities* capabilities);
   ScheduledActionDrawAndSwapResult ScheduledActionDrawAndSwapInternal(
       bool forced_draw);
@@ skipping 80 matching lines @@
 
   base::TimeTicks smoothness_takes_priority_expiration_time_;
   bool renew_tree_priority_on_impl_thread_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadProxy);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_THREAD_PROXY_H_