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

media/mojo/services/mojo_cdm_factory.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.h"
+
+#include "media/mojo/services/mojo_cdm.h"
+
+namespace media {
+
+int MojoCdmFactory::next_cdm_id_ = MojoCdm::kInvalidCdmId + 1;

[ddorwin, 2015/05/15 19:10:07]

This somewhat assumes that the Invalid value is a low number (i.e. 0). Perhaps
we should define kInitialCdmId at the same location and use it here.

+
+MojoCdmFactory::MojoCdmFactory(
+    mojo::ContentDecryptionModuleFactoryPtr remote_factory)
+    : remote_factory_(remote_factory.Pass()) {
+  DCHECK(remote_factory_);
+}
+
+MojoCdmFactory::~MojoCdmFactory() {
+}
+
+// TODO(xhwang): Pass |allow_distinctive_identifier| and
+// |allow_persistent_state| down to the remote CDM.
+scoped_ptr<MediaKeys> MojoCdmFactory::Create(
+    const std::string& key_system,
+    bool /* allow_distinctive_identifier */,
+    bool /* allow_persistent_state */,
+    const GURL& security_origin,
+    const SessionMessageCB& session_message_cb,
+    const SessionClosedCB& session_closed_cb,
+    const SessionErrorCB& session_error_cb,
+    const SessionKeysChangeCB& session_keys_change_cb,
+    const SessionExpirationUpdateCB& session_expiration_update_cb) {
+  DVLOG(2) << __FUNCTION__ << ": " << key_system;
+
+  int32_t cdm_id = next_cdm_id_++;
+  mojo::ContentDecryptionModulePtr cdm_service;
+
+  remote_factory_->Create(key_system, security_origin.spec(), cdm_id,
+                          GetProxy(&cdm_service));
+
+  // TODO(xhwang): Handle CDM creation failure more gracefully when we switch to
+  // asynchronous creation. See http://crbug.com/469003
+
+  return make_scoped_ptr(new MojoCdm(
+      cdm_service.Pass(), cdm_id, session_message_cb, session_closed_cb,
+      session_error_cb, session_keys_change_cb, session_expiration_update_cb));
+}
+
+}  // namespace media