Tweak some DVLOGs in media code.

media/filters/video_renderer_impl.cc

Index: media/filters/video_renderer_impl.cc
diff --git a/media/filters/video_renderer_impl.cc b/media/filters/video_renderer_impl.cc
index f13ff01b0cd573ac58ccbd2f6f111cf7bae687c8..55a68c86e4343e7b2f65f6ed34bda7f4a4565477 100644
--- a/media/filters/video_renderer_impl.cc
+++ b/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);