media: Add static MojoCdmService::GetCdm().

media/mojo/services/mojo_cdm_service.h

 // Copyright 2014 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_H_
 #define MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/media_keys.h"
 #include "media/mojo/interfaces/content_decryption_module.mojom.h"
 #include "media/mojo/services/mojo_cdm_promise.h"
 #include "media/mojo/services/mojo_cdm_service_context.h"
 #include "mojo/application/public/interfaces/service_provider.mojom.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace media {
 
 class CdmFactory;
 
 // A interfaces::ContentDecryptionModule implementation backed by a
 // media::MediaKeys.
 class MojoCdmService : public interfaces::ContentDecryptionModule {
  public:
+  // Get the CDM associated with |cdm_id|, which is unique per process.
+  // Can be called on any thread. The returned CDM is not guaranteed to be
+  // thread safe.
+  // Note: This provides a generic hack to get the CDM in the process where
+  // MojoMediaApplication is running, regardless of which render process or
+  // render frame the caller is associated with. In the future, we should move
+  // all out-of-process media players into the MojoMediaApplicaiton so that we
+  // can use MojoCdmServiceContext (per render frame) to get the CDM.
+  static scoped_refptr<MediaKeys> GetCdm(int cdm_id);
+
   // Constructs a MojoCdmService and strongly binds it to the |request|.
   MojoCdmService(
       base::WeakPtr<MojoCdmServiceContext> context,
       mojo::ServiceProvider* service_provider,
       CdmFactory* cdm_factory,
       mojo::InterfaceRequest<interfaces::ContentDecryptionModule> request);
 
   ~MojoCdmService() final;
 
   // interfaces::ContentDecryptionModule implementation.
@@ skipping 77 matching lines @@
 
   base::WeakPtr<MojoCdmService> weak_this_;
   base::WeakPtrFactory<MojoCdmService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoCdmService);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_H_