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

cc/output/compositor_frame.h

Index: cc/output/compositor_frame.h
diff --git a/cc/output/compositor_frame.h b/cc/output/compositor_frame.h
index e5e0c660f6faeb3930d5f3339bb686b380e605bd..127685598e6db560a2b4cfcd9bd9cd9f62f6f08c 100644
--- a/cc/output/compositor_frame.h
+++ b/cc/output/compositor_frame.h
@@ -16,19 +16,24 @@
 namespace cc {
 
 // A CompositorFrame struct contains the complete output of a compositor meant
-// for display.
-// TODO(fsamuel): Write more here.
+// for display. A CompositorFrame consists of a series of DrawQuads that
+// describe placement of textures, solid colors, overlays and other
+// CompositorFrames within an area specified by the parent compositor. DrawQuads
+// may share common data referred to as SharedQuadState. A CompositorFrame also
+// has |metadata| that refers to global graphical state associated with this
+// frame.
 class CC_EXPORT CompositorFrame {
  public:
   CompositorFrame();
+  CompositorFrame(CompositorFrame&& other);
   ~CompositorFrame();
 
+  CompositorFrame& operator=(CompositorFrame&& other);
+
   CompositorFrameMetadata metadata;
   std::unique_ptr<DelegatedFrameData> delegated_frame_data;
   std::unique_ptr<GLFrameData> gl_frame_data;
 
-  void AssignTo(CompositorFrame* target);
-
  private:
   DISALLOW_COPY_AND_ASSIGN(CompositorFrame);
 };