Tweak some DVLOGs in media code.

As a follow up to 792fb3d7, brings VideoRendererImpl in
line with AudioRendererImpl and also increases the DVLOG
level for the high-frequency CurrentMediaTime() function.

TBR=xhwang

Review URL: https://codereview.chromium.org/529333002

Cr-Commit-Position: refs/heads/master@{#293087}

media/filters/audio_renderer_impl.cc

@@ -152,7 +152,7 @@ void AudioRendererImpl::SetMediaTime(base::TimeDelta time) {
 }
 
 base::TimeDelta AudioRendererImpl::CurrentMediaTime() {
-  DVLOG(1) << __FUNCTION__;
+  DVLOG(2) << __FUNCTION__;
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   // TODO(scherkus): Finish implementing when ready to switch Pipeline to using

media/filters/video_renderer_impl.cc

@@ -68,6 +68,7 @@ VideoRendererImpl::~VideoRendererImpl() {
 }
 
 void VideoRendererImpl::Flush(const base::Closure& callback) {
+  DVLOG(1) << __FUNCTION__;
   DCHECK(task_runner_->BelongsToCurrentThread());
   base::AutoLock auto_lock(lock_);
   DCHECK_EQ(state_, kPlaying);
@@ -90,6 +91,7 @@ void VideoRendererImpl::Flush(const base::Closure& callback) {
 }
 
 void VideoRendererImpl::StartPlaying() {
+  DVLOG(1) << __FUNCTION__;
   DCHECK(task_runner_->BelongsToCurrentThread());
   base::AutoLock auto_lock(lock_);
   DCHECK_EQ(state_, kFlushed);