gpu: reference target surfaces through a globally unique surface id.

content/browser/renderer_host/render_widget_host.h

 // Copyright (c) 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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 142 matching lines @@
 
   // Gets/Sets the View of this RenderWidgetHost. Can be NULL, e.g. if the
   // RenderWidget is being destroyed or the render process crashed. You should
   // never cache this pointer since it can become NULL if the renderer crashes,
   // instead you should always ask for it using the accessor.
   void SetView(RenderWidgetHostView* view);
   RenderWidgetHostView* view() const { return view_; }
 
   content::RenderProcessHost* process() const { return process_; }
   int routing_id() const { return routing_id_; }
+  int surface_id() const { return surface_id_; }
   bool renderer_accessible() { return renderer_accessible_; }
 
   bool empty() const { return current_size_.IsEmpty(); }
 
   // Returns the property bag for this widget, where callers can add extra data
   // they may wish to associate with it. Returns a pointer rather than a
   // reference since the PropertyAccessors expect this.
   const base::PropertyBag* property_bag() const { return &property_bag_; }
   base::PropertyBag* property_bag() { return &property_bag_; }
 
@@ skipping 474 matching lines @@
   // is guaranteed never to be NULL, but its channel may be NULL if the
   // renderer crashed, so you must always check that.
   content::RenderProcessHost* process_;
 
   // Stores random bits of data for others to associate with this object.
   base::PropertyBag property_bag_;
 
   // The ID of the corresponding object in the Renderer Instance.
   int routing_id_;
 
+  // The ID of the surface corresponding to this render widget.
+  int surface_id_;
+
   // Indicates whether a page is loading or not.
   bool is_loading_;
 
   // Indicates whether a page is hidden or not.
   bool is_hidden_;
 
   // True when a page is rendered directly via the GPU process.
   bool is_accelerated_compositing_active_;
 
   // Set if we are waiting for a repaint ack for the view.
@@ skipping 132 matching lines @@
   gfx::Point last_scroll_offset_;
 
   bool pending_mouse_lock_request_;
 
   base::WeakPtrFactory<RenderWidgetHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHost);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_