Delete background tab IOSurfaces on Mac.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 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_aura.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 592 matching lines @@
                      params.route_id, gpu_host_id));
       if (!compositor->HasObserver(this))
         compositor->AddObserver(this);
     }
   }
 }
 
 void RenderWidgetHostViewAura::AcceleratedSurfaceSuspend() {
 }
 
+bool RenderWidgetHostViewAura::HasAcceleratedSurface(
+      const gfx::Size& desired_size) {
+  return false;

[piman, 2012/04/18 21:07:44]

Is that what we want? Why? Add a comment? (same for other  platforms).

[jbates, 2012/04/18 23:01:58]

Done.

+}
+
 void RenderWidgetHostViewAura::AcceleratedSurfaceNew(
       int32 width,
       int32 height,
       uint64* surface_handle,
       TransportDIB::Handle* shm_handle) {
   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
   scoped_refptr<ImageTransportClient> surface(factory->CreateTransportClient(
         gfx::Size(width, height), surface_handle));
   if (!surface) {
     LOG(ERROR) << "Failed to create ImageTransportClient";
@@ skipping 678 matching lines @@
   if (command_line.HasSwitch(switches::kDefaultDeviceScaleFactor)) {
     int default_device_scale_factor;
     base::StringToInt(command_line.GetSwitchValueASCII(
                           switches::kDefaultDeviceScaleFactor),
                       &default_device_scale_factor);
     default_dpi = default_device_scale_factor * 160;
   }
   results->verticalDPI = default_dpi;
   results->horizontalDPI = default_dpi;
 }