Add reference-counting for mailbox textures.

content/browser/renderer_host/image_transport_factory.cc

Index: content/browser/renderer_host/image_transport_factory.cc
diff --git a/content/browser/renderer_host/image_transport_factory.cc b/content/browser/renderer_host/image_transport_factory.cc
index be01420b702cfe4b776474e9fbd9c66e5d399f77..e2586e6a8dbdc8c18f4c847c9931cbd03f65abc7 100644
--- a/content/browser/renderer_host/image_transport_factory.cc
+++ b/content/browser/renderer_host/image_transport_factory.cc
@@ -19,6 +19,7 @@
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/gpu/gpu_process_host.h"
+#include "content/browser/gpu/gpu_process_host_ui_shim.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 #include "content/common/gpu/client/gl_helper.h"
@@ -67,7 +68,7 @@ class NoTransportFactory : public ImageTransportFactory {
   }
 
   virtual void DestroySharedSurfaceHandle(
-      gfx::GLSurfaceHandle surface) OVERRIDE {
+      gfx::GLSurfaceHandle surface, int surface_id) OVERRIDE {
   }
 
   virtual scoped_refptr<ui::Texture> CreateTransportClient(
@@ -433,7 +434,15 @@ class GpuProcessTransportFactory
   }
 
   virtual void DestroySharedSurfaceHandle(
-      gfx::GLSurfaceHandle surface) OVERRIDE {
+      gfx::GLSurfaceHandle surface, int surface_id) OVERRIDE {
+    int gpu_host_id =
+        shared_contexts_main_thread_->Context3d()->GetGPUProcessID();
+    int client_id = shared_contexts_main_thread_->Context3d()->GetChannelID();
+    int route_id = shared_contexts_main_thread_->Context3d()->GetContextID();
+    GpuProcessHostUIShim* ui_shim =
+        GpuProcessHostUIShim::FromID(gpu_host_id);
+    if (ui_shim)
+      ui_shim->Send(new GpuMsg_DestroySurface(client_id, route_id, surface_id));
   }
 
   virtual scoped_refptr<ui::Texture> CreateTransportClient(