Plumb the partial swap though image transport.

content/browser/renderer_host/render_widget_host_view_mac.mm

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 866 matching lines @@
     last_frame_was_accelerated_ = true;
     plugin_container_manager_.SetSurfaceWasPaintedTo(params.window,
                                                      params.surface_id);
 
     // The surface is hidden until its first paint, to not show gargabe.
     if (plugin_container_manager_.SurfaceShouldBeVisible(params.window))
       [view setHidden:NO];
     [view drawView];
   }
 
-  if (params.renderer_id != 0 || params.route_id != 0) {
-    AcknowledgeSwapBuffers(params.renderer_id,
-                           params.route_id,
-                           gpu_host_id);
+  if (params.route_id != 0) {
+    RenderWidgetHost::AcknowledgeSwapBuffers(params.route_id, gpu_host_id);
   }
 }
 
+void RenderWidgetHostViewMac::AcceleratedSurfacePostSubBuffer(
+    const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params,
+    int gpu_host_id) {
+  NOTIMPLEMENTED();
+}
+
 void RenderWidgetHostViewMac::UpdateRootGpuViewVisibility(
     bool show_gpu_widget) {
   // Plugins are destroyed on page navigate. The compositor layer on the other
   // hand is created on demand and then stays alive until its renderer process
   // dies (usually on cross-domain navigation). Instead, only a flag
   // |is_accelerated_compositing_active()| is flipped when the compositor output
   // should be shown/hidden.
   // Show/hide the view belonging to the compositor here.
   plugin_container_manager_.set_gpu_rendering_active(show_gpu_widget);
 
   gfx::PluginWindowHandle root_handle =
       plugin_container_manager_.root_container_handle();
   if (root_handle != gfx::kNullPluginWindow) {
     AcceleratedPluginView* view = ViewForPluginWindowHandle(root_handle);
     DCHECK(view);
     bool visible =
         plugin_container_manager_.SurfaceShouldBeVisible(root_handle);
     [[view window] disableScreenUpdatesUntilFlush];
     [view setHidden:!visible];
   }
 }
 
 void RenderWidgetHostViewMac::HandleDelayedGpuViewHiding() {
   if (needs_gpu_visibility_update_after_repaint_) {
     UpdateRootGpuViewVisibility(false);
     needs_gpu_visibility_update_after_repaint_ = false;
   }
 }
 
-void RenderWidgetHostViewMac::AcknowledgeSwapBuffers(
-    int renderer_id,
-    int32 route_id,
-    int gpu_host_id) {
-  TRACE_EVENT0("gpu", "RenderWidgetHostViewMac::AcknowledgeSwapBuffers");
-  // Called on the display link thread. Hand actual work off to the IO thread,
-  // because |GpuProcessHost::Get()| can only be called there.
-  // Currently, this is never called for plugins.
-  if (render_widget_host_) {
-    DCHECK_EQ(render_widget_host_->process()->GetID(), renderer_id);
-    // |render_widget_host_->routing_id()| and |route_id| are usually not
-    // equal: The former identifies the channel from the RWH in the browser
-    // process to the corresponding render widget in the renderer process, while
-    // the latter identifies the channel from the GpuCommandBufferStub in the
-    // GPU process to the corresponding command buffer client in the renderer.
-    
-    render_widget_host_->AcknowledgeSwapBuffers(route_id, gpu_host_id);
-  }
-}
-
 void RenderWidgetHostViewMac::OnAcceleratedCompositingStateChange() {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   bool activated = GetRenderWidgetHost()->is_accelerated_compositing_active();
   bool changed = accelerated_compositing_active_ != activated;
   accelerated_compositing_active_ = activated;
   if (!changed)
     return;
 
   if (accelerated_compositing_active_) {
     UpdateRootGpuViewVisibility(accelerated_compositing_active_);
@@ skipping 1775 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end