Move MediaDrmBridge provision communication to native side.

media/base/android/provision_fetcher.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_PROVISION_FETCHER_H
+#define MEDIA_BASE_PROVISION_FETCHER_H
+
+#include <string>
+
+#include "base/callback.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+// The interface to retrieve provision information for MediaDrmBridge.
+class MEDIA_EXPORT ProvisionFetcher {
+ public:
+  // After provision information is retrieved this callback will be called
+  // with the status flag (success/failure) and the provision response in
+  // case of success.
+  using ResponseCB =
+      base::Callback<void(bool success, const std::string& response)>;
+
+  virtual ~ProvisionFetcher() {}
+
+  // Requests the provision information with |default_url| and |request_data|
+  // and calls |response_cb| callback with the response. The input parameters
+  // |default_url| and |request_data| corresponds to Java class
+  // MediaDrm.ProvisionRequest.
+  // The implementation must call |response_cb| asynchronously on the same
+  // thread that this method is called.
+  virtual void Retrieve(const std::string& default_url,
+                        const std::string& request_data,
+                        const ResponseCB& response_cb) = 0;
+};
+
+// The factory class that creates ProvisionFetcher objects.
+class ProvisionFetcherFactory {
+ public:
+  virtual ~ProvisionFetcherFactory() {}
+
+  virtual scoped_ptr<ProvisionFetcher> CreateFetcher() const = 0;
+};

[xhwang, 2015/11/12 22:27:03]

I can see this is following the model of CdmFactory. But it seems we have only
one implementation for ProvisionFetcherFactory, which is used in only two cases,
and we actually don't need it in one case (see above in
MediaDrmCredentialManager). This makes me wonder whether a creation callback
(e.g. create_provision_fetcher_cb) would just suffice (and be simpler)? 

base::Callback<scoped_ptr<ProvisionFetcher>());

And we only need this callback for AndroidCdmFactory.

[Tima Vaisburd, 2015/11/13 03:13:10]

Done.

+
+}  // namespace media
+
+#endif  // MEDIA_BASE_PROVISION_FETCHER_H