Switch to using TimeTicks rather than Time in message loops

base/message_loop.h

 // Copyright (c) 2006-2008 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 BASE_MESSAGE_LOOP_H_
 #define BASE_MESSAGE_LOOP_H_
 #pragma once
 
 #include <queue>
 #include <string>
@@ skipping 323 matching lines @@
    public:
     explicit AutoRunState(MessageLoop* loop);
     ~AutoRunState();
    private:
     MessageLoop* loop_;
     RunState* previous_state_;
   };
 
   // This structure is copied around by value.
   struct PendingTask {
-    Task* task;                   // The task to run.
-    base::Time delayed_run_time;  // The time when the task should be run.
-    int sequence_num;             // Used to facilitate sorting by run time.
-    bool nestable;                // True if OK to dispatch from a nested loop.
+    Task* task;                        // The task to run.
+    base::TimeTicks delayed_run_time;  // The time when the task should be run.
+    int sequence_num;                  // Secondary sort key for run time.
+    bool nestable;                     // OK to dispatch from a nested loop.
 
     PendingTask(Task* task, bool nestable)
         : task(task), sequence_num(0), nestable(nestable) {
     }
 
     // Used to support sorting.
     bool operator<(const PendingTask& other) const;
   };
 
   class TaskQueue : public std::queue<PendingTask> {
@@ skipping 64 matching lines @@
   // destructor to make sure all the task's destructors get called.  Returns
   // true if some work was done.
   bool DeletePendingTasks();
 
   // Post a task to our incomming queue.
   void PostTask_Helper(const tracked_objects::Location& from_here, Task* task,
                        int64 delay_ms, bool nestable);
 
   // base::MessagePump::Delegate methods:
   virtual bool DoWork();
-  virtual bool DoDelayedWork(base::Time* next_delayed_work_time);
+  virtual bool DoDelayedWork(base::TimeTicks* next_delayed_work_time);
   virtual bool DoIdleWork();
 
   // 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();
 
   // Add occurence of event to our histogram, so that we can see what is being
   // done in a specific MessageLoop instance (i.e., specific thread).
   // If message_histogram_ is NULL, this is a no-op.
   void HistogramEvent(int event);
 
   Type type_;
 
   // A list of tasks that need to be processed by this instance.  Note that
   // this queue is only accessed (push/pop) by our current thread.
   TaskQueue work_queue_;
 
   // Contains delayed tasks, sorted by their 'delayed_run_time' property.
   DelayedTaskQueue delayed_work_queue_;
 
   // A recent snapshot of Time::Now(), used to check delayed_work_queue_.
-  base::Time recent_time_;
+  base::TimeTicks recent_time_;
 
   // A queue of non-nestable tasks that we had to defer because when it came
   // time to execute them we were in a nested message loop.  They will execute
   // once we're out of nested message loops.
   TaskQueue deferred_non_nestable_work_queue_;
 
   scoped_refptr<base::MessagePump> pump_;
 
   ObserverList<DestructionObserver> destruction_observers_;
 
@@ skipping 144 matching lines @@
 #endif  // defined(OS_POSIX)
 };
 
 // Do not add any member variables to MessageLoopForIO!  This is important b/c
 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO).  Any extra
 // data that you need should be stored on the MessageLoop's pump_ instance.
 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
                MessageLoopForIO_should_not_have_extra_member_variables);
 
 #endif  // BASE_MESSAGE_LOOP_H_