Add ability to pass decryption key id to CreateSecureMessage method

chrome/common/extensions/api/easy_unlock_private.idl

Index: chrome/common/extensions/api/easy_unlock_private.idl
diff --git a/chrome/common/extensions/api/easy_unlock_private.idl b/chrome/common/extensions/api/easy_unlock_private.idl
index 5a33e5e26457c0396b4b87bca1bab50e21dd725d..3d2ff39b59a36bb253b6565a214a40a3e3c4818d 100644
--- a/chrome/common/extensions/api/easy_unlock_private.idl
+++ b/chrome/common/extensions/api/easy_unlock_private.idl
@@ -82,6 +82,10 @@
     // signature.
     ArrayBuffer? verificationKeyId;
 
+    // Decryption key id added to the message header. It's used by the message

[Yoyo Zhou, 2014/08/29 18:59:45]

nit: Don't need "It's"

[tbarzic, 2014/08/29 19:14:53]

Done.

+    // 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;