Change to calculate the real NTP in TimeTicks.

media/cast/cast_environment.h

 // 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.
 
 #ifndef MEDIA_CAST_CAST_ENVIRONMENT_H_
 #define MEDIA_CAST_CAST_ENVIRONMENT_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/task_runner.h"
@@ skipping 15 matching lines @@
     AUDIO_ENCODER,
     // The audio decoder thread is where all receive side audio processing is
     // done, primarily decoding but also error concealment and re-sampling.
     AUDIO_DECODER,
     // The video encoder thread is where the video encode processing is done.
     VIDEO_ENCODER,
     // The video decoder thread is where the video decode processing is done.
     VIDEO_DECODER,
   };
 
+  // For real applications (not tests) the clock provided should be a
+  // CastNtpTickClock.
   CastEnvironment(base::TickClock* clock,
                   scoped_refptr<base::TaskRunner> main_thread_proxy,
                   scoped_refptr<base::TaskRunner> audio_encode_thread_proxy,
                   scoped_refptr<base::TaskRunner> audio_decode_thread_proxy,
                   scoped_refptr<base::TaskRunner> video_encode_thread_proxy,
                   scoped_refptr<base::TaskRunner> video_decode_thread_proxy);
 
   // These are the same methods in message_loop.h, but are guaranteed to either
   // get posted to the MessageLoop if it's still alive, or be deleted otherwise.
   // They return true iff the thread existed and the task was posted.  Note that
@@ skipping 28 matching lines @@
   scoped_refptr<base::TaskRunner> video_encode_thread_proxy_;
   scoped_refptr<base::TaskRunner> video_decode_thread_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(CastEnvironment);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_CAST_ENVIRONMENT_H_