PPAPI: Support sending browser-hosted resources synchronously

content/renderer/pepper/message_channel.h

Index: content/renderer/pepper/message_channel.h
diff --git a/content/renderer/pepper/message_channel.h b/content/renderer/pepper/message_channel.h
index 4889777ed76de51152bb7b6a3030fe9660ac993e..777d459f072603f4d3fa1db602aa0af71112032c 100644
--- a/content/renderer/pepper/message_channel.h
+++ b/content/renderer/pepper/message_channel.h
@@ -186,6 +186,11 @@ class MessageChannel :
   // Observers for sync messages.
   base::Closure unregister_observer_callback_;
 
+  // This one is used only for var conversion result callbacks. In some cases,
+  // we want to force pending conversions to happen synchronously and cancel
+  // all pending callbacks.
+  base::WeakPtrFactory<MessageChannel> var_conversion_weak_ptr_factory_;
+
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<MessageChannel> weak_ptr_factory_;