Backport some work from sample to embedder:

runtime/embedders/android/sound_service.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef EMBEDDERS_ANDROID_SOUND_SERVICE_H_
 #define EMBEDDERS_ANDROID_SOUND_SERVICE_H_
 
 #include <android_native_app_glue.h>
 #include <SLES/OpenSLES.h>
 #include <SLES/OpenSLES_Android.h>
 #include <SLES/OpenSLES_AndroidConfiguration.h>
+#include <vector>
+#include "embedders/android/sample.h"
 #include "embedders/android/types.h"
 
 class SoundService {
   public:
     explicit SoundService(android_app* application);
     int32_t Start();
     void Stop();
 
     int32_t PlayBackground(const char* path);
     void StopBackground();
 
+    // Optional, for preloading.
+    int32_t LoadSample(const char* path) {
+       return (GetSample(path) == NULL) ? -1 : 0;
+    }
+
+    int32_t PlaySample(const char* path);
+
   private:
+    typedef std::vector<Sample*> samples_t;
+
+    int32_t CreateAudioPlayer(SLEngineItf engine_if,
+                              const SLInterfaceID extra_if,
+                              SLDataSource data_source,
+                              SLDataSink data_sink,
+                              SLObjectItf& player_out,
+                              SLPlayItf& player_if_out);
+
+    int32_t StartSamplePlayer();
+    Sample* GetSample(const char* path);
+
     android_app* application_;
     SLObjectItf engine_;
     SLEngineItf engine_if_;
     SLObjectItf output_mix_;
     SLObjectItf background_player_;
     SLPlayItf background_player_if_;
     SLSeekItf background_player_seek_if_;
+    SLObjectItf sample_player_;
+    SLPlayItf sample_player_if_;
+    SLBufferQueueItf sample_player_queue_;
+    samples_t samples_;
 };
 
-void PlayBackground(const char* path);
-void StopBackground();
+int32_t PlayBackgroundSound(const char* path);
+void StopBackgroundSound();
 #endif  // EMBEDDERS_ANDROID_SOUND_SERVICE_H_