Make cc::CompositorFrames movable [Part 1 of 2]

cc/output/software_renderer.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_OUTPUT_SOFTWARE_RENDERER_H_
 #define CC_OUTPUT_SOFTWARE_RENDERER_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 18 matching lines @@
   static std::unique_ptr<SoftwareRenderer> Create(
       RendererClient* client,
       const RendererSettings* settings,
       OutputSurface* output_surface,
       ResourceProvider* resource_provider,
       bool use_image_hijack_canvas);
 
   ~SoftwareRenderer() override;
   const RendererCapabilitiesImpl& Capabilities() const override;
   void Finish() override;
-  void SwapBuffers(const CompositorFrameMetadata& metadata) override;
+  void SwapBuffers(CompositorFrameMetadata metadata) override;
   void DiscardBackbuffer() override;
   void EnsureBackbuffer() override;
 
  protected:
   void BindFramebufferToOutputSurface(DrawingFrame* frame) override;
   bool BindFramebufferToTexture(DrawingFrame* frame,
                                 const ScopedResource* texture) override;
   void SetScissorTestRect(const gfx::Rect& scissor_rect) override;
   void PrepareSurfaceForPass(DrawingFrame* frame,
                              SurfaceInitializationMode initialization_mode,
@@ skipping 73 matching lines @@
   // draw when a GPU ImageDecodeController is in use, as software rasterization
   // cannot use the GPU IDC.
   const bool use_image_hijack_canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(SoftwareRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_SOFTWARE_RENDERER_H_