[webcrypto] Add the KeyAlgorithm interface.

Source/modules/crypto/RsaHashedKeyAlgorithm.idl

Index: Source/modules/crypto/RsaHashedKeyAlgorithm.idl
diff --git a/Source/modules/crypto/Algorithm.idl b/Source/modules/crypto/RsaHashedKeyAlgorithm.idl
similarity index 91%
rename from Source/modules/crypto/Algorithm.idl
rename to Source/modules/crypto/RsaHashedKeyAlgorithm.idl
index a1373bde07516fd21f8e1a7f5cf2b58c888cbc5a..28b765dc420a8a8751618de368e807542433c5ae 100644
--- a/Source/modules/crypto/Algorithm.idl
+++ b/Source/modules/crypto/RsaHashedKeyAlgorithm.idl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -29,8 +29,7 @@
  */
 
 [
-    WillBeGarbageCollected,
     NoInterfaceObject
-] interface Algorithm {
-    readonly attribute DOMString name;
+] interface RsaHashedKeyAlgorithm : RsaKeyAlgorithm {
+  readonly attribute KeyAlgorithm hash;
 };