PPAPI: Make PPB_MessageLoop_Dev::GetForMainThread work

ppapi/tests/test_utils.cc

 // 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.
 
 #include "ppapi/tests/test_utils.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #if defined(_MSC_VER)
 #include <windows.h>
@@ skipping 71 matching lines @@
     GetTestingInterface()->RunMessageLoop(instance_);
   waiting_ = false;
 }
 
 void NestedEvent::Signal() {
   signalled_ = true;
   if (waiting_)
     GetTestingInterface()->QuitMessageLoop(instance_);
 }
 
+void NestedEvent::Reset() {
+  // It doesn't make sense to reset when we're still waiting.
+  PP_DCHECK(!waiting_);
+  // We must have already been Signalled().
+  PP_DCHECK(signalled_);
+  signalled_ = false;
+}
+
 TestCompletionCallback::TestCompletionCallback(PP_Instance instance)
     : wait_for_result_called_(false),
       have_result_(false),
       result_(PP_OK_COMPLETIONPENDING),
       // TODO(dmichael): The default should probably be PP_REQUIRED, but this is
       //                 what the tests currently expect.
       callback_type_(PP_OPTIONAL),
       post_quit_task_(false),
       run_count_(0),  // TODO(dmichael): Remove when all tests are updated.
       instance_(instance),
@@ skipping 116 matching lines @@
   callback->have_result_ = true;
   callback->run_count_++;  // TODO(dmichael): Remove when all tests are updated.
   if (callback->delegate_)
     callback->delegate_->OnCallback(user_data, result);
   if (callback->post_quit_task_) {
     callback->post_quit_task_ = false;
     GetTestingInterface()->QuitMessageLoop(callback->instance_);
   }
 }