Adds some CHECKs to MessagePumpMojo

base/message_loop/message_loop.cc

 // Copyright 2013 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_loop/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 74 matching lines @@
 #endif  // !defined(OS_NACL)
 
 bool enable_histogrammer_ = false;
 
 MessageLoop::MessagePumpFactory* message_pump_for_ui_factory_ = NULL;
 
 // Returns true if MessagePump::ScheduleWork() must be called one
 // time for every task that is added to the MessageLoop incoming queue.
 bool AlwaysNotifyPump(MessageLoop::Type type) {
 #if defined(OS_ANDROID)
+  // The Android UI message loop needs to get notified each time a task is added
+  // to the incoming queue.
   return type == MessageLoop::TYPE_UI || type == MessageLoop::TYPE_JAVA;
 #else
   return false;
 #endif
 }
 
 #if defined(OS_IOS)
 typedef MessagePumpIOSForIO MessagePumpForIO;
 #elif defined(OS_NACL)
 typedef MessagePumpDefault MessagePumpForIO;
@@ skipping 416 matching lines @@
 void MessageLoop::ReloadWorkQueue() {
   // We can improve performance of our loading tasks from the incoming queue to
   // |*work_queue| by waiting until the last minute (|*work_queue| is empty) to
   // load. That reduces the number of locks-per-task significantly when our
   // queues get large.
   if (work_queue_.empty())
     incoming_task_queue_->ReloadWorkQueue(&work_queue_);
 }
 
 void MessageLoop::ScheduleWork(bool was_empty) {
-  // The Android UI message loop needs to get notified each time
-  // a task is added to the incoming queue.
   if (was_empty || AlwaysNotifyPump(type_))
     pump_->ScheduleWork();
 }
 
 //------------------------------------------------------------------------------
 // Method and data for histogramming events and actions taken by each instance
 // on each thread.
 
 void MessageLoop::StartHistogrammer() {
 #if !defined(OS_NACL)  // NaCl build has no metrics code.
@@ skipping 174 matching lines @@
       persistent,
       mode,
       controller,
       delegate);
 }
 #endif
 
 #endif  // !defined(OS_NACL)
 
 }  // namespace base