BrowserMediaPlayerManager manages MediaKeys objects.

media/base/android/cdm_factory_android.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/base/android/cdm_factory.h"
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/base/android/media_drm_bridge.h"
+#include "media/base/media_switches.h"
+
+namespace media {
+
+scoped_ptr<MediaKeys> CreateCdm(const std::string& key_system,
+                                const SessionCreatedCB& session_created_cb,
+                                const SessionMessageCB& session_message_cb,
+                                const SessionReadyCB& session_ready_cb,
+                                const SessionClosedCB& session_closed_cb,
+                                const SessionErrorCB& session_error_cb) {
+  if (!MediaDrmBridge::IsKeySystemSupported(key_system)) {
+    NOTREACHED() << "Unsupported key system: " << key_system;
+    return scoped_ptr<MediaKeys>();
+  }
+
+  scoped_ptr<MediaDrmBridge> cdm(MediaDrmBridge::Create(key_system,

[ddorwin, 2014/05/13 00:59:38]

Are we sure this will never fail? The returned value is not checked. To be safe,
we should probably check it since we may forget if that code is ever changed.

[xhwang, 2014/05/14 16:42:06]

Done.

+                                                        session_created_cb,
+                                                        session_message_cb,
+                                                        session_ready_cb,
+                                                        session_closed_cb,
+                                                        session_error_cb));
+
+  // TODO(xhwang/ddorwin): Pass the security level from key system.
+  MediaDrmBridge::SecurityLevel security_level =
+      MediaDrmBridge::SECURITY_LEVEL_3;
+  if (CommandLine::ForCurrentProcess()
+          ->HasSwitch(switches::kMediaDrmEnableNonCompositing)) {

[damienv1, 2014/05/12 21:37:53]

nit: looks weird to break the line on "->". Would rather break it after
HasSwitch:
CommandLine::ForCurrentProcess()->HasSwitch(
 ...)

[xhwang, 2014/05/14 16:42:06]

Done.

+    security_level = MediaDrmBridge::SECURITY_LEVEL_1;
+  }
+  if (!cdm->SetSecurityLevel(security_level)) {
+    DVLOG(1) << "failed to set security level " << security_level;
+    return scoped_ptr<MediaKeys>();
+  }
+
+  return cdm.PassAs<MediaKeys>();
+}
+
+}  // namespace media