media/cast/sender: Rename deadline_utilization to encoder_utilization.

media/cast/sender/sender_encoded_frame.h

 // Copyright 2015 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_SENDER_SENDER_ENCODED_FRAME_H_
 #define MEDIA_CAST_SENDER_SENDER_ENCODED_FRAME_H_
 
 #include "base/time/time.h"
 #include "media/cast/net/cast_transport_config.h"
 
 namespace media {
 namespace cast {
 
 // Extends EncodedFrame with additional fields used within the sender-side of
 // the library.
 struct SenderEncodedFrame : public EncodedFrame {
   SenderEncodedFrame();
   ~SenderEncodedFrame() final;
 
-  // The amount of real-world time it took to encode the frame, divided by the
-  // maximum amount of time allowed.  Example: For the software VP8 encoder,
-  // this would be the elapsed encode time (according to the base::TimeTicks
-  // clock) divided by the VideoFrame's duration.
+  // The amount the encoder was utilized for this frame. Example: For the
+  // software VP8 encoder, this would be the elapsed encode time (according to
+  // the base::TimeTicks clock) divided by the VideoFrame's duration.
   //
   // Meaningful values are non-negative, with 0.0 [impossibly] representing 0%
   // utilization, 1.0 representing 100% utilization, and values greater than 1.0
-  // indicating the encode time took longer than the media duration of the
-  // frame.  Negative values indicate the field was not computed.
-  //
-  // TODO(miu): Rename to encoder_cpu_utilization.
-  double deadline_utilization;
+  // indicating the encoder utilized more resources than a maximum sustainable
+  // rate, based on the data volume of the input.  Negative values indicate the
+  // field was not computed.
+  double encoder_utilization;
 
   // The amount of "lossiness" needed to encode the frame within the targeted
   // bandwidth.  More-complex frame content and/or lower target encode bitrates
   // will cause this value to rise.
   //
   // Meaningful values are non-negative, with 0.0 indicating the frame is very
   // simple and/or the target encode bitrate is very large, 1.0 indicating the
   // frame contains very complex content and/or the target encode bitrate is
   // very small, and values greater than 1.0 indicating the encoder cannot
   // encode the frame within the target bitrate (even at its lowest quality
   // setting).  Negative values indicate the field was not computed.
   //
   // TODO(miu): Rename to idealized_bitrate_utilization.
   double lossy_utilization;
 
   // The time at which the encode of the frame completed.
   base::TimeTicks encode_completion_time;
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_SENDER_SENDER_ENCODED_FRAME_H_