Add PlayerTracker and BrowserCdm interfaces.

- PlayerTracker interface can be used by any CDM that needs to track media
  players. It can notify media players of new abailable key (to resume playback)
  or the destruction of the CDM.
- PlayerTrackerImpl is a simple implementation of PlayerTracker that can help
  any CDM to implement PlayerTracker interface.
- BrowserCdm is a common CDM interface for browser side CDMs.
- CdmFactory is renamed to BrowserCdmFactory.
- Now BrowserMediaPlayer only needs to call SetCdm() on the player and do not
  need to track CDM <-> player mapping.

TBR=damienv@chromium.org
BUG=373327
TEST=Existing test pages still work.

Review URL: https://codereview.chromium.org/308073004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274470 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 31 insertions, 0 deletions

diff --git a/media/base/browser_cdm_factory.h b/media/base/browser_cdm_factory.h
new file mode 100644
index 0000000..4e86c8b
--- /dev/null
+++ b/media/base/browser_cdm_factory.h
@@ -0,0 +1,31 @@
+// 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_BASE_BROWSER_CDM_FACTORY_H_
+#define MEDIA_BASE_BROWSER_CDM_FACTORY_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "media/base/media_export.h"
+#include "media/base/media_keys.h"
+
+namespace media {
+
+class BrowserCdm;
+
+// Creates a BrowserCdm for |key_system|. Returns NULL if the CDM cannot be
+// created.
+// TODO(xhwang): Add ifdef for IPC based CDM.
+scoped_ptr<BrowserCdm> MEDIA_EXPORT
+    CreateBrowserCdm(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);
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_BROWSER_CDM_FACTORY_H_