Add ability to pass decryption key id to CreateSecureMessage method

chrome/common/extensions/api/easy_unlock_private.idl

 // 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.
 
 // <code>chrome.easyUnlockPrivate</code> API that provides hooks to Chrome to
 // be used by Easy Unlock component app.
 [nodoc] namespace easyUnlockPrivate {
   // Signature algorithms supported by the crypto library methods used by
   // Easy Unlock.
   enum SignatureType {
@@ skipping 59 matching lines @@
   dictionary CreateSecureMessageOptions {
     // Data associated with the message. The data will not be sent with the
     // message, but the message recepient will use the same data on its side
     // to verify the message.
     ArrayBuffer? associatedData;
 
     // Metadata to be added to the message header.
     ArrayBuffer? publicMetadata;
 
     // Verification key id added to the message header. Should be set if the
-    // message is signed using |ECDSA_P256_SHA256|. It's used by the message
+    // message is signed using |ECDSA_P256_SHA256|. Used by the message
     // recepient to determine which key should be used to verify the message
     // signature.
     ArrayBuffer? verificationKeyId;
 
+    // Decryption key id added to the message header. Used by the message
+    // recepient to determine which key should be used to decrypt the message.
+    ArrayBuffer? decryptionKeyId;
+
     // The encryption algorithm that should be used to encrypt the message.
     // Should not be set for a cleartext message.
     EncryptionType? encryptType;
 
     // The algorithm to be used to sign the message.
     // Defaults to |HMAC_SHA256|. |ECDSA_P256_SHA256| can currently be used
     // only with cleartext messages.
     SignatureType? signType;
   };
 
@@ skipping 155 matching lines @@
     // Saves the remote device list.
     // |devices|: The list of remote devices to be saved.
     // |callback|: Called to indicate success or failure.
     static void setRemoteDevices(Device[] devices,
                                  optional EmptyCallback callback);
 
     // Gets the remote device list.
     static void getRemoteDevices(GetRemoteDevicesCallback callback);
   };
 };