Chrome-side of making CallOnMainThread use a completion callback....

webkit/glue/plugins/pepper_plugin_module.cc

Index: webkit/glue/plugins/pepper_plugin_module.cc
===================================================================
--- webkit/glue/plugins/pepper_plugin_module.cc	(revision 51487)
+++ webkit/glue/plugins/pepper_plugin_module.cc	(working copy)
@@ -95,10 +95,12 @@
   return base::Time::Now().ToDoubleT();
 }
 
-void CallOnMainThread(int delay_in_msec, void (*func)(void*), void* context) {
+void CallOnMainThread(int delay_in_msec,
+                      PP_CompletionCallback callback,
+                      int32_t result) {
   GetMainThreadMessageLoop()->PostDelayedTask(
       FROM_HERE,
-      NewRunnableFunction(func, context),
+      NewRunnableFunction(callback.func, callback.user_data, result),
       delay_in_msec);
 }