[Hotword] Adding audio parameters to handle audio coming from the DSP.

media/audio/cras/cras_input_unittest.cc

Index: media/audio/cras/cras_input_unittest.cc
diff --git a/media/audio/cras/cras_input_unittest.cc b/media/audio/cras/cras_input_unittest.cc
index 7081a98e907a6ebd9e897ab3db25bac71fa8f111..5aaed7218aa2a67617f8e823ad42d1b8ad304cfc 100644
--- a/media/audio/cras/cras_input_unittest.cc
+++ b/media/audio/cras/cras_input_unittest.cc
@@ -212,4 +212,29 @@ TEST_F(CrasInputStreamTest, CaptureFrames) {
   }
 }
 
+TEST_F(CrasInputStreamTest, HotwordSampleReady) {
+  AudioParameters params(kTestFormat,
+                         CHANNEL_LAYOUT_MONO,
+                         kTestSampleRate,
+                         kTestBitsPerSample,
+                         kTestFramesPerPacket,
+                         HARDWARE_INPUT);
+  CrasInputStream* test_stream =
+      new CrasInputStream(params, mock_manager_.get(),
+                          AudioManagerBase::kDefaultDeviceId);
+  ASSERT_TRUE(test_stream->Open());
+
+  MockAudioInputCallback mock_callback;
+  base::WaitableEvent event(false, false);
+  EXPECT_CALL(mock_callback, OnData(test_stream, _, _, _))
+    .WillOnce(InvokeWithoutArgs(&event, &base::WaitableEvent::Signal));
+  test_stream->Start(&mock_callback);
+
+  // Wait for samples to be captured.
+  EXPECT_TRUE(event.TimedWait(TestTimeouts::action_timeout()));
+
+  test_stream->Stop();
+  test_stream->Close();
+}
+
 }  // namespace media