[webcrypto] Make KeyPair structured clonable.

LayoutTests/crypto/resources/common.js

Index: LayoutTests/crypto/resources/common.js
diff --git a/LayoutTests/crypto/resources/common.js b/LayoutTests/crypto/resources/common.js
index 8169e9be66654a7a8200edeb3168499318d6b15b..afcfe11510130903b3d2c45c22c9e9ad4e36399b 100644
--- a/LayoutTests/crypto/resources/common.js
+++ b/LayoutTests/crypto/resources/common.js
@@ -69,12 +69,18 @@ function failAndFinishJSTest(error)
     finishJSTest();
 }
 
-// Returns a Promise for the cloned key.
+// FIXME: Delete this and use cloneObject() directly.
 function cloneKey(key)
 {
+    return cloneObject(key);
+}
+
+// Returns a Promise for the cloned object.
+function cloneObject(obj)
+{
     // Sending an object through a MessagePort implicitly clones it.
     // Use a single MessageChannel so requests complete in FIFO order.
-    var self = cloneKey;
+    var self = cloneObject;
     if (!self.channel) {
         self.channel = new MessageChannel();
         self.callbacks = [];
@@ -87,7 +93,7 @@ function cloneKey(key)
 
     return new Promise(function(resolve, reject) {
         self.callbacks.push(resolve);
-        self.channel.port2.postMessage(key);
+        self.channel.port2.postMessage(obj);
     });
 }