Add reference-counting for mailbox textures.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 913e63c8f155e91b96a1204ee16cdd70141567d1..be0c39d4f6bf25886fab6e29af4d1a496334c483 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1563,6 +1563,7 @@ void RenderWidgetHostViewAura::AcceleratedSurfaceRelease() {
         compositor->AddObserver(this);
     }
     current_surface_ = NULL;
+    LOG(INFO) << "Releasing frontbuffer";
     UpdateExternalTexture();
   }
 }
@@ -2469,7 +2470,8 @@ void RenderWidgetHostViewAura::OnLostResources() {
 
   DCHECK(!shared_surface_handle_.is_null());
   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
-  factory->DestroySharedSurfaceHandle(shared_surface_handle_);
+  factory->DestroySharedSurfaceHandle(shared_surface_handle_,
+                                      host_->surface_id());
   shared_surface_handle_ = factory->CreateSharedSurfaceHandle();
   host_->CompositingSurfaceUpdated();
   host_->ScheduleComposite();
@@ -2483,7 +2485,8 @@ RenderWidgetHostViewAura::~RenderWidgetHostViewAura() {
     paint_observer_->OnViewDestroyed();
   if (!shared_surface_handle_.is_null()) {
     ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
-    factory->DestroySharedSurfaceHandle(shared_surface_handle_);
+    factory->DestroySharedSurfaceHandle(shared_surface_handle_,
+                                        host_->surface_id());
     factory->RemoveObserver(this);
   }
   window_observer_.reset();