PPAPI: Make PPB_MessageLoop_Dev::GetForMainThread work

ppapi/tests/test_utils.h

 // Copyright (c) 2012 The Chromium 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 PPAPI_TESTS_TEST_UTILS_H_
 #define PPAPI_TESTS_TEST_UTILS_H_
 
 #include <string>
 
 #include "ppapi/c/dev/ppb_testing_dev.h"
@@ skipping 32 matching lines @@
 class NestedEvent {
  public:
   explicit NestedEvent(PP_Instance instance)
       : instance_(instance), waiting_(false), signalled_(false) {
   }
   // Run a nested message loop and wait until Signal() is called. If Signal()
   // has already been called, return immediately without running a nested loop.
   void Wait();
   // Signal the NestedEvent. If Wait() has been called, quit the message loop.
   void Signal();
+  // Reset the NestedEvent so it can be used again.
+  void Reset();
  private:
   PP_Instance instance_;
   bool waiting_;
   bool signalled_;
   // Disable copy and assign.
   NestedEvent(const NestedEvent&);
   NestedEvent& operator=(const NestedEvent&);
 };
 
 enum CallbackType { PP_REQUIRED, PP_OPTIONAL, PP_BLOCKING };
@@ skipping 136 matching lines @@
 #error Please add support for your platform in ppapi/tests/test_utils.h
 #endif
 
 /* These are used to determine POSIX-like implementations vs Windows. */
 #if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
     defined(__OpenBSD__) || defined(__sun) || defined(__native_client__)
 #define PPAPI_POSIX 1
 #endif
 
 #endif  // PPAPI_TESTS_TEST_UTILS_H_