Cast: Deduplicate event types in cast library.

media/cast/logging/receiver_time_offset_estimator_impl.h

 // Copyright 2014 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_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_IMPL_H_
 #define MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_IMPL_H_
 
 #include "base/time/time.h"
 #include "base/threading/thread_checker.h"
 #include "media/cast/logging/logging_defines.h"
 #include "media/cast/logging/receiver_time_offset_estimator.h"
 
 namespace media {
 namespace cast {
 
-// This implementation listens to three types of events:
-// 1. kVideoFrameEncoded (sender side)
-// 2. kVideoAckSent (receiver side)
-// 3. kVideoAckReceived (sender side)
+// This implementation listens to three types of video events:
+// 1. FRAME_ENCODED (sender side)
+// 2. FRAME_ACK_SENT (receiver side)
+// 3. FRAME_ACK_RECEIVED (sender side)
 // There is a causal relationship between these events in that these events
 // must happen in order. This class obtains the lower and upper bounds for
 // the offset by taking the difference of timestamps (2) - (1) and (2) - (3),
 // respectively.
 // The bound will become better as the latency between the events decreases.
 class ReceiverTimeOffsetEstimatorImpl : public ReceiverTimeOffsetEstimator {
  public:
   ReceiverTimeOffsetEstimatorImpl();
 
   virtual ~ReceiverTimeOffsetEstimatorImpl();
@@ skipping 25 matching lines @@
   base::TimeDelta offset_upper_bound_;
 
   base::ThreadChecker thread_checker_;
   DISALLOW_COPY_AND_ASSIGN(ReceiverTimeOffsetEstimatorImpl);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_IMPL_H_