Sprinkle some DVLOGs in media::WallClockTimeSource.

media/base/wall_clock_time_source.cc

Index: media/base/wall_clock_time_source.cc
diff --git a/media/base/wall_clock_time_source.cc b/media/base/wall_clock_time_source.cc
index 5d826435576421913ab48ed8b313644420245721..408de93e05e830867278d3e667bc3ff4ad59abb2 100644
--- a/media/base/wall_clock_time_source.cc
+++ b/media/base/wall_clock_time_source.cc
@@ -19,6 +19,7 @@ WallClockTimeSource::~WallClockTimeSource() {
 }
 
 void WallClockTimeSource::StartTicking() {
+  DVLOG(1) << __FUNCTION__;
   base::AutoLock auto_lock(lock_);
   DCHECK(!ticking_);
   ticking_ = true;
@@ -26,6 +27,7 @@ void WallClockTimeSource::StartTicking() {
 }
 
 void WallClockTimeSource::StopTicking() {
+  DVLOG(1) << __FUNCTION__;
   base::AutoLock auto_lock(lock_);
   DCHECK(ticking_);
   base_time_ = CurrentMediaTime_Locked();
@@ -34,6 +36,7 @@ void WallClockTimeSource::StopTicking() {
 }
 
 void WallClockTimeSource::SetPlaybackRate(float playback_rate) {
+  DVLOG(1) << __FUNCTION__ << "(" << playback_rate << ")";
   base::AutoLock auto_lock(lock_);
   // Estimate current media time using old rate to use as a new base time for
   // the new rate.
@@ -46,6 +49,7 @@ void WallClockTimeSource::SetPlaybackRate(float playback_rate) {
 }
 
 void WallClockTimeSource::SetMediaTime(base::TimeDelta time) {
+  DVLOG(1) << __FUNCTION__ << "(" << time.InMicroseconds() << ")";
   base::AutoLock auto_lock(lock_);
   CHECK(!ticking_);
   base_time_ = time;