Add Promises for EME (Chromium side)

ppapi/api/private/pp_content_decryptor.idl

 /* Copyright (c) 2012 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.
  */
 
 /**
  * The <code>PP_DecryptTrackingInfo</code> struct contains necessary information
  * that can be used to associate the decrypted block with a decrypt request
  * and/or an input block.
  */
@@ skipping 381 matching lines @@
 };
 
 /**
  * <code>PP_DecryptorStreamType</code> contains stream type constants.
  */
 [assert_size(4)]
 enum PP_DecryptorStreamType {
   PP_DECRYPTORSTREAMTYPE_AUDIO = 0,
   PP_DECRYPTORSTREAMTYPE_VIDEO = 1
 };
+
+/**
+ * <code>PP_SessionType</code> contains session type constants.
+ */
+[assert_size(4)]
+enum PP_SessionType {
+  PP_SESSIONTYPE_TEMPORARY = 0,
+  PP_SESSIONTYPE_PERSISTENT = 1
+};
+
+/**
+ * <code>PP_CdmExceptionCode</code> contains exception code constants.
+ */
+[assert_size(4)]
+enum PP_CdmExceptionCode {
+  PP_CDMEXCEPTIONCODE_NOTSUPPORTEDERROR = 1,
+  PP_CDMEXCEPTIONCODE_INVALIDSTATEERROR = 2,
+  PP_CDMEXCEPTIONCODE_INVALIDACCESSERROR = 3,
+  PP_CDMEXCEPTIONCODE_QUOTAEXCEEDEDERROR = 4,
+  PP_CDMEXCEPTIONCODE_UNKNOWNERROR = 5,
+  PP_CDMEXCEPTIONCODE_CLIENTERROR = 6,
+  PP_CDMEXCEPTIONCODE_OUTPUTERROR = 7
+};