Adding audio unit tests for Android

media/audio/android/audio_manager_android.cc

Index: media/audio/android/audio_manager_android.cc
diff --git a/media/audio/android/audio_manager_android.cc b/media/audio/android/audio_manager_android.cc
index 69bd2b82cd44458048338f31c32953f4c84c9f8b..66dadb9712976b49cf5760cd9855817ee200d9a1 100644
--- a/media/audio/android/audio_manager_android.cc
+++ b/media/audio/android/audio_manager_android.cc
@@ -59,11 +59,13 @@ void AudioManagerAndroid::GetAudioInputDeviceNames(
 
 AudioParameters AudioManagerAndroid::GetInputStreamParameters(
     const std::string& device_id) {
+  const media::ChannelLayout kChannelLayout = media::CHANNEL_LAYOUT_MONO;
   int buffer_size = Java_AudioManagerAndroid_getMinInputFrameSize(
-      base::android::AttachCurrentThread(), GetNativeOutputSampleRate(), 2);
+      base::android::AttachCurrentThread(), GetNativeOutputSampleRate(),
+      ChannelLayoutToChannelCount(kChannelLayout));
 
   return AudioParameters(
-      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, kChannelLayout,
       GetNativeOutputSampleRate(), 16,
       buffer_size <= 0 ? kDefaultInputBufferSize : buffer_size);
 }