media: Add MojoCdmServiceContext.

media/mojo/services/mojo_cdm_service_context.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_MOJO_SERVICES_MOJO_CDM_SERVICE_CONTEXT_H_
+#define MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_CONTEXT_H_
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "base/macros.h"
+#include "media/base/cdm_context.h"
+#include "media/base/media_export.h"
+#include "media/mojo/services/mojo_cdm_service.h"
+
+namespace media {
+
+// A class that creates, owns and manages all MojoCdmService instances.
+class MEDIA_EXPORT MojoCdmServiceContext : public CdmContextProvider {
+ public:
+  MojoCdmServiceContext();
+  ~MojoCdmServiceContext() override;
+
+  // Creates a MojoCdmService for |key_system| and weakly binds it to |request|.
+  // The created MojoCdmService is owned by |this|. The request will be dropped
+  // if no MojoCdmService can be created, resulting in a connection error.
+  void CreateCdmService(
+      const mojo::String& key_system,
+      const mojo::String& security_origin,
+      int32_t cdm_id,
+      mojo::InterfaceRequest<mojo::ContentDecryptionModule> request);
+
+  // CdmContextProvider implementation.
+  // The returned CdmContext can be destroyed at any time if the pipe is
+  // disconnected.
+  // TODO(xhwang): When implementing SetCdm(), make sure we never dereference
+  // garbage. For example, use media::PlayerTracker.
+  CdmContext* GetCdmContext(int32_t cdm_id) override;
+
+  // Called when there is a connection error with |service|.
+  void ServiceHadConnectionError(MojoCdmService* service);
+
+ private:
+  // A map between CDM ID and MojoCdmService. Owns all MojoCdmService created.
+  base::ScopedPtrHashMap<int32_t, scoped_ptr<MojoCdmService>> services_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoCdmServiceContext);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_CONTEXT_H_