Add an API to pump the message loop to libplatform

include/libplatform/libplatform.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_LIBPLATFORM_LIBPLATFORM_H_
 #define V8_LIBPLATFORM_LIBPLATFORM_H_
 
 #include "include/v8-platform.h"
 
 namespace v8 {
 namespace platform {
 
 /**
  * Returns a new instance of the default v8::Platform implementation.
  *
  * The caller will take ownership of the returned pointer. |thread_pool_size|
  * is the number of worker threads to allocate for background jobs. If a value
  * of zero is passed, a suitable default based on the current number of
  * processors online will be chosen.
  */
 v8::Platform* CreateDefaultPlatform(int thread_pool_size = 0);
 
 
+/**
+ * Pumps the message loop for the given isolate.
+ *
+ * The caller has to make sure that this is called from the right thread.
+ * Returns true if a task was executed, and false otherwise. This call does
+ * not block if not task is pending. The |platform| has to be created using

[marja, 2014/07/03 09:26:35]

nit: if *no* task..

+ * |CreateDefaultPlatform|.
+ */
+bool PumpMessageLoop(v8::Platform* platform, v8::Isolate* isolate);
+
+
 }  // namespace platform
 }  // namespace v8
 
 #endif  // V8_LIBPLATFORM_LIBPLATFORM_H_