[Chromecast] Allow CMA backend to notify of key expiry

chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc

Index: chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
diff --git a/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc b/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
index 25524a788b5e654d4c725a178681a38417b0ae47..f2552950ca8ee7546abaf25ad17c38db6d17e040 100644
--- a/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
+++ b/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
@@ -99,6 +99,9 @@ class AudioVideoPipelineDeviceTest : public testing::Test,
                             MediaPipelineBackend::BufferStatus status) override;
   void OnEndOfStream(MediaPipelineBackend::Decoder* decoder) override;
   void OnDecoderError(MediaPipelineBackend::Decoder* decoder) override;
+  void OnKeyStatusChanged(const std::string& key_id,
+                          CastKeyStatus key_status,
+                          uint32_t system_code) override;
 
  private:
   void Initialize();
@@ -342,6 +345,12 @@ void AudioVideoPipelineDeviceTest::OnDecoderError(
   ASSERT_TRUE(false);
 }
 
+void AudioVideoPipelineDeviceTest::OnKeyStatusChanged(const std::string& key_id,
+                                                      CastKeyStatus key_status,
+                                                      uint32_t system_code) {
+  ASSERT_TRUE(false);
+}
+
 void AudioVideoPipelineDeviceTest::OnPushBufferComplete(
     MediaPipelineBackend::Decoder* decoder,
     MediaPipelineBackend::BufferStatus status) {