media: Add MediaPermission interface and MediaPermissionDispatcher.

media/base/media_permission.cc

Index: media/base/media_permission.cc
diff --git a/media/base/cdm_key_information.cc b/media/base/media_permission.cc
similarity index 55%
copy from media/base/cdm_key_information.cc
copy to media/base/media_permission.cc
index ebaf8b135ca8fb0184940919b2d7caa3d467fa85..739e4454ae76be702c1ddde201fc9680575d9c9e 100644
--- a/media/base/cdm_key_information.cc
+++ b/media/base/media_permission.cc
@@ -2,15 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/base/cdm_key_information.h"
+#include "media/base/media_permission.h"
 
 namespace media {
 
-CdmKeyInformation::CdmKeyInformation()
-    : status(INTERNAL_ERROR), system_code(0) {
+MediaPermission::MediaPermission() {
 }
 
-CdmKeyInformation::~CdmKeyInformation() {
+MediaPermission::~MediaPermission() {
 }
 
 }  // namespace media