Convert media constants to constexpr.

media/base/android/media_statistics.cc

 // 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.
 
 #include "media/base/android/media_statistics.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "media/base/android/demuxer_stream_player_params.h"
 
@@ skipping 23 matching lines @@
   ++late;
 }
 
 MediaStatistics::MediaStatistics() {}
 
 MediaStatistics::~MediaStatistics() {}
 
 void MediaStatistics::Start(base::TimeDelta current_playback_time) {
   DVLOG(1) << __FUNCTION__;
 
-  if (start_time_ == kNoTimestamp()) {
+  if (start_time_ == kNoTimestamp) {
     Clear();
     start_time_ = current_playback_time;
   }
 }
 
 void MediaStatistics::StopAndReport(base::TimeDelta current_playback_time) {
   DVLOG(1) << __FUNCTION__;
 
-  if (start_time_ == kNoTimestamp())
+  if (start_time_ == kNoTimestamp)
     return;  // skip if there was no prior Start().
 
-  if (current_playback_time == kNoTimestamp()) {
+  if (current_playback_time == kNoTimestamp) {
     // Cancel the start event and skip if current time is unknown.
-    start_time_ = kNoTimestamp();
+    start_time_ = kNoTimestamp;
     return;
   }
 
   base::TimeDelta duration = current_playback_time - start_time_;
 
   // Reset start time.
-  start_time_ = kNoTimestamp();
+  start_time_ = kNoTimestamp;
 
   if (duration < base::TimeDelta::FromSeconds(kMinDurationInSeconds))
     return;  // duration is too short.
 
   if (duration > base::TimeDelta::FromSeconds(kMaxDurationInSeconds))
     return;  // duration is too long.
 
   Report(duration);
 }
 
 void MediaStatistics::Clear() {
-  start_time_ = kNoTimestamp();
+  start_time_ = kNoTimestamp;
   audio_frame_stats_.Clear();
   video_frame_stats_.Clear();
   num_starvations_ = 0;
 }
 
 void MediaStatistics::Report(base::TimeDelta duration) {
   DVLOG(1) << __FUNCTION__ << " duration:" << duration
            << " audio frames:"
            << audio_frame_stats_.late << "/" << audio_frame_stats_.total
            << " video frames:"
@@ skipping 28 matching lines @@
 
   uint32_t total_frames = audio_frame_stats_.total ? audio_frame_stats_.total
                                                    : video_frame_stats_.total;
   if (total_frames) {
     UMA_HISTOGRAM_COUNTS("Media.MSE.Starvations",
                          kOneMillion * num_starvations_ / total_frames);
   }
 }
 
 }  // namespace media