Add base::RunLoop and update ui_test_utils to use it to reduce flakiness

base/message_pump_android.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 "base/message_pump_android.h"
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 55 matching lines @@
 
 MessagePumpForUI::~MessagePumpForUI() {
 }
 
 void MessagePumpForUI::Run(Delegate* delegate) {
   NOTREACHED() << "UnitTests should rely on MessagePumpForUIStub in"
       " test_stub_android.h";
 }
 
 void MessagePumpForUI::Start(Delegate* delegate) {
-  state_ = new MessageLoop::AutoRunState(MessageLoop::current());
+  state_ = new MessageLoop::AutoRunState(MessageLoop::current(), NULL);
 
   DCHECK(g_system_message_handler_obj.Get().is_null());
 
   JNIEnv* env = base::android::AttachCurrentThread();
   DCHECK(env);
 
   g_system_message_handler_obj.Get().Reset(
       Java_SystemMessageHandler_create(env, reinterpret_cast<jint>(delegate)));
 }
 
@@ skipping 38 matching lines @@
   Java_SystemMessageHandler_setDelayedTimer(env,
       g_system_message_handler_obj.Get().obj(), millis);
 }
 
 // Register native methods
 bool RegisterSystemMessageHandler(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace base