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

content/renderer/render_widget.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_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 #pragma once
 
 #include <deque>
 #include <vector>
@@ skipping 73 matching lines @@
   // The compositing surface assigned by the RenderWidgetHost
   // (or RenderViewHost). Will be gfx::kNullPluginWindow if not assigned yet,
   // in which case we should not create any GPU command buffers with it.
   // The routing ID assigned by the RenderProcess. Will be MSG_ROUTING_NONE if
   // not yet assigned a view ID, in which case, the process MUST NOT send
   // messages with this ID to the parent.
   int32 routing_id() const {
     return routing_id_;
   }
 
+  int32 surface_id() const {
+    return surface_id_;
+  }
+
   // May return NULL when the window is closing.
   WebKit::WebWidget* webwidget() const { return webwidget_; }
 
   gfx::NativeViewId host_window() const { return host_window_; }
   gfx::Size size() const { return size_; }
   bool has_focus() const { return has_focus_; }
   bool is_fullscreen() const { return is_fullscreen_; }
   bool is_hidden() const { return is_hidden_; }
 
   // IPC::Channel::Listener
@@ skipping 227 matching lines @@
   virtual void DidHandleTouchEvent(const WebKit::WebTouchEvent& event) {}
 
   // Should return true if the underlying WebWidget is responsible for
   // the scheduling of compositing requests.
   virtual bool WebWidgetHandlesCompositorScheduling() const;
 
   // Routing ID that allows us to communicate to the parent browser process
   // RenderWidgetHost. When MSG_ROUTING_NONE, no messages may be sent.
   int32 routing_id_;
 
+  int32 surface_id_;
+
   // We are responsible for destroying this object via its Close method.
   WebKit::WebWidget* webwidget_;
 
   // Set to the ID of the view that initiated creating this view, if any. When
   // the view was initiated by the browser (the common case), this will be
   // MSG_ROUTING_NONE. This is used in determining ownership when opening
   // child tabs. See RenderWidget::createWebViewWithRequest.
   //
   // This ID may refer to an invalid view if that view is closed before this
   // view is.
@@ skipping 129 matching lines @@
   // delay sending of UpdateRect until the corresponding SwapBuffers has been
   // executed. Since we can have several in flight, we need to keep them in a
   // queue. Note: some SwapBuffers may not correspond to an update, in which
   // case NULL is added to the queue.
   std::deque<ViewHostMsg_UpdateRect*> updates_pending_swap_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_