Add flow control between renderer and GPU processes, and, on Mac OS X,...

chrome/browser/renderer_host/render_widget_host_view.h

 // Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #pragma once
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
@@ skipping 207 matching lines @@
   virtual void AcceleratedSurfaceSetIOSurface(
       gfx::PluginWindowHandle window,
       int32 width,
       int32 height,
       uint64 io_surface_identifier) = 0;
   virtual void AcceleratedSurfaceSetTransportDIB(
       gfx::PluginWindowHandle window,
       int32 width,
       int32 height,
       TransportDIB::Handle transport_dib) = 0;
+  // |window| and |surface_id| indicate which accelerated surface's
+  // buffers swapped. |renderer_id|, |route_id| and
+  // |swap_buffers_count| are used to formulate a reply to the GPU
+  // process to prevent it from getting too far ahead. They may all be
+  // zero, in which case no flow control is enforced; this case is
+  // currently used for accelerated plugins.
   virtual void AcceleratedSurfaceBuffersSwapped(
-      gfx::PluginWindowHandle window, uint64 surface_id) = 0;
+      gfx::PluginWindowHandle window,
+      uint64 surface_id,
+      int renderer_id,
+      int32 route_id,
+      uint64 swap_buffers_count) = 0;
   virtual void GpuRenderingStateDidChange() = 0;
 #endif
 
 #if defined(TOOLKIT_USES_GTK)
   virtual void CreatePluginContainer(gfx::PluginWindowHandle id) = 0;
   virtual void DestroyPluginContainer(gfx::PluginWindowHandle id) = 0;
 #endif
 
   // Toggles visual muting of the render view area. This is on when a
   // constrained window is showing.
@@ skipping 42 matching lines @@
 
   // The current reserved area in view coordinates where contents should not be
   // rendered to draw the resize corner, sidebar mini tabs etc.
   gfx::Rect reserved_rect_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostView);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_