[Aura] Added Support for rendering software compositor frames as cc::TextureLayers.

ui/compositor/layer.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 UI_COMPOSITOR_LAYER_H_
 #define UI_COMPOSITOR_LAYER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "cc/animation/animation_events.h"
 #include "cc/animation/layer_animation_event_observer.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/texture_layer_client.h"
+#include "cc/resources/texture_mailbox.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/layer_animation_delegate.h"
 #include "ui/compositor/layer_delegate.h"
 #include "ui/compositor/layer_type.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
 
 class SkCanvas;
@@ skipping 213 matching lines @@
   const std::string& name() const { return name_; }
   void set_name(const std::string& name) { name_ = name; }
 
   const ui::Texture* texture() const { return texture_.get(); }
 
   // Assigns a new external texture.  |texture| can be NULL to disable external
   // updates.
   void SetExternalTexture(ui::Texture* texture);
   ui::Texture* external_texture() { return texture_.get(); }
 
+  // Set new TextureMailbox for this layer. Note that |mailbox| may hold a
+  // shared memory resource or an actual mailbox for a texture.
+  void SetTextureMailbox(const cc::TextureMailbox& mailbox, float scale_factor);
+  cc::TextureMailbox GetTextureMailbox(float* scale_factor);
+
   // Sets a delegated frame, coming from a child compositor.
   void SetDelegatedFrame(scoped_ptr<cc::DelegatedFrameData> frame,
                          gfx::Size frame_size_in_dip);
 
   // Gets unused resources to recycle to the child compositor.
   void TakeUnusedResourcesForChildCompositor(
       cc::TransferableResourceArray* array);
 
   // Sets the layer's fill color.  May only be called for LAYER_SOLID_COLOR.
   void SetColor(SkColor color);
@@ skipping 195 matching lines @@
   scoped_refptr<cc::DelegatedRendererLayer> delegated_renderer_layer_;
   cc::Layer* cc_layer_;
 
   // If true, the layer scales the canvas and the texture with the device scale
   // factor as appropriate. When true, the texture size is in DIP.
   bool scale_content_;
 
   // A cached copy of |Compositor::device_scale_factor()|.
   float device_scale_factor_;
 
+  // A cached copy of the TextureMailbox given texture_layer_.
+  cc::TextureMailbox mailbox_;
+
+  // Device scale factor in which mailbox_ was rendered in.
+  float mailbox_scale_factor_;
+
   // The size of the delegated frame in DIP, set when SetDelegatedFrame was
   // called.
   gfx::Size delegated_frame_size_in_dip_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_