MediaLog: Log selected audio/video decoder name.

media/filters/video_renderer_impl_unittest.cc

Index: media/filters/video_renderer_impl_unittest.cc
diff --git a/media/filters/video_renderer_impl_unittest.cc b/media/filters/video_renderer_impl_unittest.cc
index b81f81ab1d976a880c33421c3249399dee16ee40..4b5a0a053c33275288d30d0fe85f64548c4b727c 100644
--- a/media/filters/video_renderer_impl_unittest.cc
+++ b/media/filters/video_renderer_impl_unittest.cc
@@ -47,6 +47,8 @@ MATCHER_P(HasTimestamp, ms, "") {
 // and kTimeToDeclareHaveNothing.
 static const int kVideoDurationInMs = 10000;
 
+static void LogFunc(const std::string& str) { DVLOG(1) << str; }
+
 class VideoRendererImplTest : public ::testing::Test {
  public:
   VideoRendererImplTest()
@@ -60,7 +62,8 @@ class VideoRendererImplTest : public ::testing::Test {
         decoders.Pass(),
         media::SetDecryptorReadyCB(),
         base::Bind(&StrictMock<MockCB>::Display, base::Unretained(&mock_cb_)),
-        true));
+        true,
+        base::Bind(&LogFunc)));
 
     demuxer_stream_.set_video_decoder_config(TestVideoConfig::Normal());