Adding audio unit tests for Android

media/audio/android/audio_manager_android.h

Index: media/audio/android/audio_manager_android.h
diff --git a/media/audio/android/audio_manager_android.h b/media/audio/android/audio_manager_android.h
index fa1c3736a3593ee5b14ea8f846f2d4d1cfd36ac2..c85399969b7c915f830d004d034542849b4a951c 100644
--- a/media/audio/android/audio_manager_android.h
+++ b/media/audio/android/audio_manager_android.h
@@ -6,6 +6,7 @@
 #define MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
 
 #include "base/android/jni_android.h"
+#include "base/gtest_prod_util.h"
 #include "media/audio/audio_manager_base.h"
 
 namespace media {
@@ -59,6 +60,9 @@ class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
   int GetAudioLowLatencyOutputFrameSize();
   int GetOptimalOutputFrameSize(int sample_rate, int channels);
 
+  // Allow the AudioAndroidTest to access private methods.
+  FRIEND_TEST_ALL_PREFIXES(AudioAndroidTest, IsAudioLowLatencySupported);
+
   // Java AudioManager instance.
   base::android::ScopedJavaGlobalRef<jobject> j_audio_manager_;