Add callback in VideoDecoder and AudioDecoder to return decoded frames.

media/filters/opus_audio_decoder_unittest.cc

Index: media/filters/opus_audio_decoder_unittest.cc
diff --git a/media/filters/opus_audio_decoder_unittest.cc b/media/filters/opus_audio_decoder_unittest.cc
index 3e17e15afb241fe51f043206ff127cbdb658bcdf..38e9f6f4f8d7cc56e29a7bb49963e29ceccd5009 100644
--- a/media/filters/opus_audio_decoder_unittest.cc
+++ b/media/filters/opus_audio_decoder_unittest.cc
@@ -57,7 +57,10 @@ class OpusAudioDecoderTest : public testing::Test {
   }
 
   void InitializeDecoder(const AudioDecoderConfig& config) {
-    decoder_->Initialize(config, NewExpectedStatusCB(PIPELINE_OK));
+    decoder_->Initialize(config,
+                         NewExpectedStatusCB(PIPELINE_OK),
+                         base::Bind(&OpusAudioDecoderTest::OnDecoderOutput,
+                                    base::Unretained(this)));
     base::RunLoop().RunUntilIdle();
   }
 
@@ -91,22 +94,16 @@ class OpusAudioDecoderTest : public testing::Test {
     base::RunLoop().RunUntilIdle();
   }
 
-  void DecodeFinished(AudioDecoder::Status status,
-                      const scoped_refptr<AudioBuffer>& buffer) {
+  void OnDecoderOutput(const scoped_refptr<AudioBuffer>& buffer) {
+    decoded_audio_.push_back(buffer);
+  }
+
+  void DecodeFinished(AudioDecoder::Status status) {
     EXPECT_TRUE(pending_decode_);
     pending_decode_ = false;
 
-    if (status == AudioDecoder::kNotEnoughData) {
-      EXPECT_TRUE(buffer.get() == NULL);
-      Decode();
-      return;
-    }
-
-    decoded_audio_.push_back(buffer);
-
-    // If we hit a NULL buffer or have a pending reset, we expect an abort.
-    if (buffer.get() == NULL || pending_reset_) {
-      EXPECT_TRUE(buffer.get() == NULL);
+    // If we have a pending reset, we expect an abort.
+    if (pending_reset_) {
       EXPECT_EQ(status, AudioDecoder::kAborted);
       return;
     }