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

cc/output/compositor_frame_metadata.h

 // Copyright (c) 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_COMPOSITOR_FRAME_METADATA_H_
 #define CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "cc/base/cc_export.h"
 #include "cc/input/selection.h"
 #include "cc/surfaces/surface_id.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/events/latency_info.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 #include "ui/gfx/selection_bound.h"
 
 namespace cc {
 
 class CC_EXPORT CompositorFrameMetadata {
  public:
   CompositorFrameMetadata();
+  CompositorFrameMetadata(CompositorFrameMetadata&& other);
   CompositorFrameMetadata(const CompositorFrameMetadata& other);
   ~CompositorFrameMetadata();
 
+  CompositorFrameMetadata& operator=(CompositorFrameMetadata&& other);
+
   // The device scale factor used to generate this compositor frame.
   float device_scale_factor;
 
   // Scroll offset and scale of the root layer. This can be used for tasks
   // like positioning windowed plugins.
   gfx::Vector2dF root_scroll_offset;
   float page_scale_factor;
 
   // These limits can be used together with the scroll/scale fields above to
   // determine if scrolling/scaling in a particular direction is possible.
@@ skipping 24 matching lines @@
   // namespace as the current Surface).
   std::vector<uint32_t> satisfies_sequences;
 
   // This is the set of Surfaces that are referenced by this frame.
   std::vector<SurfaceId> referenced_surfaces;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_