media: Support creation and SetCdm() for mojo based CDM.

media/mojo/services/mojo_cdm_factory_service.cc

+// 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.
+
+#include "media/mojo/services/mojo_cdm_factory_service.h"
+
+#include "base/logging.h"
+#include "media/mojo/services/mojo_cdm_service_context.h"
+
+namespace media {
+
+MojoCdmFactoryService::MojoCdmFactoryService(MojoCdmServiceContext* context)
+    : context_(context) {
+  DCHECK(context_);
+}
+
+MojoCdmFactoryService::~MojoCdmFactoryService() {
+}
+
+void MojoCdmFactoryService::Create(
+    const mojo::String& key_system,
+    const mojo::String& security_origin,
+    int32_t cdm_id,
+    mojo::InterfaceRequest<mojo::ContentDecryptionModule> cdm) {
+  DVLOG(1) << __FUNCTION__ << ": " << key_system;
+  MojoCdmService* cdm_service =
+      context_->Create(key_system, security_origin, cdm_id);
+
+  if (!cdm_service) {
+    LOG(ERROR) << "MojoCdmService cannot be created.";
+    return;
+  }
+
+  mojo::WeakBindToRequest(cdm_service, &cdm);
+}
+
+}  // namespace media