Backport some work from sample to embedder:

runtime/embedders/android/sample.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_SAMPLE_H_
+#define EMBEDDERS_ANDROID_SAMPLE_H_
+
+#include "embedders/android/context.h"
+#include "embedders/android/resource.h"
+
+class Sample {
+  public:
+    Sample(android_app* application, const char* path)
+        : resource_(application, path),
+          buffer_(NULL),
+          length_(0) {
+    }
+
+    ~Sample() {
+      Unload();
+    }
+
+    const char* path() {
+      return resource_.path();
+    }
+
+    int32_t Load() {
+      int32_t rtn = -1;
+      if (resource_.Open() == 0) {
+        buffer_ = new uint8_t[length_ = resource_.length()];
+        rtn = resource_.Read(buffer_, length_);
+        resource_.Close();
+      }
+      return rtn;
+    }
+
+    void Unload() {
+      if (buffer_ != NULL) {
+        delete[] buffer_;
+        buffer_ = NULL;
+      }
+      length_ = 0;
+    }
+
+  private:
+    friend class SoundService;
+    Resource resource_;
+    uint8_t* buffer_;
+    off_t length_;
+};
+
+#endif  // EMBEDDERS_ANDROID_SAMPLE_H_