Adding audio unit tests for Android

media/audio/android/opensles_input.h

Index: media/audio/android/opensles_input.h
diff --git a/media/audio/android/opensles_input.h b/media/audio/android/opensles_input.h
index 9743992fc653e16cacbbce8644acec4e4d361f63..6bdaed1389df26dd720f43c8d167edb188ff4689 100644
--- a/media/audio/android/opensles_input.h
+++ b/media/audio/android/opensles_input.h
@@ -9,6 +9,8 @@
 #include <SLES/OpenSLES_Android.h>
 
 #include "base/compiler_specific.h"
+#include "base/synchronization/lock.h"
+#include "base/threading/thread_checker.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 #include "media/audio/android/opensles_util.h"
@@ -41,9 +43,11 @@ class OpenSLESInputStream : public AudioInputStream {
  private:
   bool CreateRecorder();
 
+  // Called from OpenSLES specific audio worker thread.
   static void SimpleBufferQueueCallback(
       SLAndroidSimpleBufferQueueItf buffer_queue, void* instance);
 
+  // Called from OpenSLES specific audio worker thread.
   void ReadBufferQueue();
 
   // Called in Open();
@@ -56,6 +60,12 @@ class OpenSLESInputStream : public AudioInputStream {
   // the attached AudioInputCallback::OnError().
   void HandleError(SLresult error);
 
+  base::ThreadChecker thread_checker_;
+
+  // Protects |started_|, |callback_|, |active_queue_|, |audio_data_|,
+  // |buffer_size_bytes_| and |simple_buffer_queue_|.
+  base::Lock lock_;
+
   AudioManagerAndroid* audio_manager_;
 
   AudioInputCallback* callback_;