Adds MediaClientAndroid to support embedder/MediaDrmBridge interaction.

media/base/android/media_client_android.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_BASE_ANDROID_MEDIA_CLIENT_ANDROID_H_
+#define MEDIA_BASE_ANDROID_MEDIA_CLIENT_ANDROID_H_
+
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/containers/hash_tables.h"
+#include "base/macros.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+class MediaClientAndroid;
+class MediaDrmBridgeDelegate;
+
+// Setter for MediaClientAndroid. This should be called early in embedder
+// lifecycle, before any media playback could occur.
+MEDIA_EXPORT void SetMediaClientAndroid(MediaClientAndroid* media_client);
+
+#if defined(MEDIA_IMPLEMENTATION)
+// Getter for the client. Returns nullptr if no customized client is needed.
+MediaClientAndroid* GetMediaClientAndroid();
+#endif
+
+using UUID = std::vector<uint8_t>;
+
+// A client interface for embedders (e.g. content/browser) to provide customized
+// additions to Android's browser-side media handling.
+class MEDIA_EXPORT MediaClientAndroid {
+ public:
+  MediaClientAndroid();
+  virtual ~MediaClientAndroid();
+
+  // Returns extra mappings from key-system name to Android UUID.
+  const base::hash_map<std::string, UUID>& GetKeySystemUUIDMappings() const;
+
+  // Returns a MediaDrmBridgeDelegate that corresponds to |scheme_uuid|.

[xhwang, 2015/04/28 05:25:11]

Document about the ownership of the returned object.

[gunsch, 2015/04/28 18:50:51]

Done.

+  virtual media::MediaDrmBridgeDelegate* GetMediaDrmBridgeDelegate(
+      const UUID& scheme_uuid) const;
+
+ protected:
+  void AddKeySystemUUIDMapping(const std::string& key_system,
+                               const UUID& scheme_uuid);
+
+ private:
+  base::hash_map<std::string, UUID> key_system_uuid_map_;

[xhwang, 2015/04/28 05:25:11]

In MediaDrmBridge we have [1]:

typedef base::hash_map<std::string, UUID> KeySystemUuidMap;

Can we do it here and let MediaDrmBridge just use
MediaClientAndroid::KeySystemUuidMap?

[1]
https://code.google.com/p/chromium/codesearch#chromium/src/media/base/android...

+
+  DISALLOW_COPY_AND_ASSIGN(MediaClientAndroid);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_ANDROID_MEDIA_CLIENT_ANDROID_H_