Implement TextureImageTransportSurface using texture mailbox

ui/gfx/native_widget_types.h

Index: ui/gfx/native_widget_types.h
diff --git a/ui/gfx/native_widget_types.h b/ui/gfx/native_widget_types.h
index 6dbc4e774cca7022ef1b87496131d437115805d3..22a675664abb59afb9fda9243381fbb949f67ab6 100644
--- a/ui/gfx/native_widget_types.h
+++ b/ui/gfx/native_widget_types.h
@@ -278,30 +278,19 @@ struct GLSurfaceHandle {
       : handle(kNullPluginWindow),
         transport(false),
         parent_gpu_process_id(0),
-        parent_client_id(0),
-        parent_context_id(0),
-        sync_point(0) {
-    parent_texture_id[0] = 0;
-    parent_texture_id[1] = 0;
+        parent_client_id(0) {
   }
   GLSurfaceHandle(PluginWindowHandle handle_, bool transport_)
       : handle(handle_),
         transport(transport_),
         parent_gpu_process_id(0),
-        parent_client_id(0),
-        parent_context_id(0),
-        sync_point(0) {
-    parent_texture_id[0] = 0;
-    parent_texture_id[1] = 0;
+        parent_client_id(0) {
   }
   bool is_null() const { return handle == kNullPluginWindow && !transport; }
   PluginWindowHandle handle;
   bool transport;
   int parent_gpu_process_id;
   uint32 parent_client_id;
-  uint32 parent_context_id;
-  uint32 parent_texture_id[2];
-  uint32 sync_point;
 };
 
 // AcceleratedWidget provides a surface to compositors to paint pixels.