Pepper UDP socket: buffer received packets in the plugin process to improve performance.

ppapi/host/resource_message_filter.h

Index: ppapi/host/resource_message_filter.h
diff --git a/ppapi/host/resource_message_filter.h b/ppapi/host/resource_message_filter.h
index b72a7df7db286fb8a2d1c7dff6c6e0d217286e45..67e9b79da461cf6a054fd616d37fa8c40b11b752 100644
--- a/ppapi/host/resource_message_filter.h
+++ b/ppapi/host/resource_message_filter.h
@@ -106,6 +106,10 @@ class PPAPI_HOST_EXPORT ResourceMessageFilter
  protected:
   virtual ~ResourceMessageFilter();
 
+  // Please see the comments of |resource_host_| for on which thread it can be
+  // used and when it is NULL.
+  ResourceHost* resource_host() const { return resource_host_; }
+
   // If you want the message to be handled on another thread, return a non-null
   // task runner which will target tasks accordingly.
   virtual scoped_refptr<base::TaskRunner> OverrideTaskRunnerForMessage(