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

chrome/browser/gpu_process_host.cc

 // 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.
 
 #include "chrome/browser/gpu_process_host.h"
 
 #include "app/app_switches.h"
 #include "base/command_line.h"
 #include "base/thread.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 254 matching lines @@
 }
 
 namespace {
 
 class BuffersSwappedDispatcher : public Task {
  public:
   BuffersSwappedDispatcher(
       int32 renderer_id,
       int32 render_view_id,
       gfx::PluginWindowHandle window,
-      uint64 surface_id)
+      uint64 surface_id,
+      int32 route_id,
+      uint64 swap_buffers_count)
       : renderer_id_(renderer_id),
         render_view_id_(render_view_id),
         window_(window),
-        surface_id_(surface_id) {
+        surface_id_(surface_id),
+        route_id_(route_id),
+        swap_buffers_count_(swap_buffers_count) {
   }
 
   void Run() {
     RenderViewHost* host = RenderViewHost::FromID(renderer_id_,
                                                   render_view_id_);
     if (!host)
       return;
     RenderWidgetHostView* view = host->view();
     if (!view)
       return;
-    view->AcceleratedSurfaceBuffersSwapped(window_, surface_id_);
+    view->AcceleratedSurfaceBuffersSwapped(
+        // Parameters needed to swap the IOSurface.
+        window_,
+        surface_id_,
+        // Parameters needed to formulate an acknowledgment.
+        renderer_id_,
+        route_id_,
+        swap_buffers_count_);
   }
 
  private:
   int32 renderer_id_;
   int32 render_view_id_;
   gfx::PluginWindowHandle window_;
   uint64 surface_id_;
+  int32 route_id_;
+  uint64 swap_buffers_count_;
 
   DISALLOW_COPY_AND_ASSIGN(BuffersSwappedDispatcher);
 };
 
 }  // namespace
 
 void GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped(
-    int32 renderer_id,
-    int32 render_view_id,
-    gfx::PluginWindowHandle window,
-    uint64 surface_id) {
+    const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       new BuffersSwappedDispatcher(
-          renderer_id, render_view_id, window, surface_id));
+          // These are the parameters needed to look up the IOSurface
+          // on this side.
+          params.renderer_id,
+          params.render_view_id,
+          params.window,
+          params.surface_id,
+          // These are additional parameters needed to formulate an
+          // acknowledgment.
+          params.route_id,
+          params.swap_buffers_count));
 }
 #endif
 
 void GpuProcessHost::SendEstablishChannelReply(
     const IPC::ChannelHandle& channel,
     const GPUInfo& gpu_info,
     ResourceMessageFilter* filter) {
   ViewMsg_GpuChannelEstablished* message =
       new ViewMsg_GpuChannelEstablished(channel, gpu_info);
   // If the renderer process is performing synchronous initialization,
@@ skipping 66 matching lines @@
       FilePath(),
 #elif defined(OS_POSIX)
       false,  // Never use the zygote (GPU plugin can't be sandboxed).
       base::environment_vector(),
 #endif
       cmd_line);
 
   return true;
 }