Microbenchmark for the cost of posting tasks to different pump types

base/message_loop/message_loop.h

Index: base/message_loop/message_loop.h
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index 8db1e77daf38b21e191df7c0108b6abe0d6571fe..3cec37e1a0b87b6e0a1aae873a2e21405ecb4fdf 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -391,12 +391,22 @@ class BASE_EXPORT MessageLoop : public MessagePump::Delegate {
   // Returns true if the message loop is "idle". Provided for testing.
   bool IsIdleForTesting();
 
+  // Wakes up the message pump. Can be called on any thread. The caller is
+  // responsible for synchronizing ScheduleWork() calls.
+  void ScheduleWork(bool was_empty);
+
+  // Returns the TaskAnnotator which is used to add debug information to posted
+  // tasks.
+  debug::TaskAnnotator* task_annotator() { return &task_annotator_; }
+
+  // Runs the specified PendingTask.
+  void RunTask(const PendingTask& pending_task);
+
   //----------------------------------------------------------------------------
  protected:
   scoped_ptr<MessagePump> pump_;
 
  private:
-  friend class internal::IncomingTaskQueue;
   friend class RunLoop;
 
   // Configures various members for the two constructors.
@@ -408,9 +418,6 @@ class BASE_EXPORT MessageLoop : public MessagePump::Delegate {
   // Called to process any delayed non-nestable tasks.
   bool ProcessNextDelayedNonNestableTask();
 
-  // Runs the specified PendingTask.
-  void RunTask(const PendingTask& pending_task);
-
   // Calls RunTask or queues the pending_task on the deferred task list if it
   // cannot be run right now.  Returns true if the task was run.
   bool DeferOrRunPendingTask(const PendingTask& pending_task);
@@ -423,18 +430,10 @@ class BASE_EXPORT MessageLoop : public MessagePump::Delegate {
   // true if some work was done.
   bool DeletePendingTasks();
 
-  // Returns the TaskAnnotator which is used to add debug information to posted
-  // tasks.
-  debug::TaskAnnotator* task_annotator() { return &task_annotator_; }
-
   // Loads tasks from the incoming queue to |work_queue_| if the latter is
   // empty.
   void ReloadWorkQueue();
 
-  // Wakes up the message pump. Can be called on any thread. The caller is
-  // responsible for synchronizing ScheduleWork() calls.
-  void ScheduleWork(bool was_empty);
-
   // Start recording histogram info about events and action IF it was enabled
   // and IF the statistics recorder can accept a registration of our histogram.
   void StartHistogrammer();