Hook up the Push API with GCM's new ability to own encryption keys.

chrome/test/data/push_messaging/push_test.js

Index: chrome/test/data/push_messaging/push_test.js
diff --git a/chrome/test/data/push_messaging/push_test.js b/chrome/test/data/push_messaging/push_test.js
index 607126f3c39f90a4e52a893ca43074459b353c94..6cc1785479defef57974568e70aed435e4588d4e 100644
--- a/chrome/test/data/push_messaging/push_test.js
+++ b/chrome/test/data/push_messaging/push_test.js
@@ -106,6 +106,16 @@ function subscribePush() {
   }).catch(sendErrorToTest);
 }
 
+function getCurve25519dh() {
+  navigator.serviceWorker.ready.then(function(swRegistration) {
+    return swRegistration.pushManager.getSubscription()
+        .then(function(subscription) {
+          sendResultToTest(btoa(String.fromCharCode.apply(null,
+              new Uint8Array(subscription.curve25519dh))));
+        });
+  }).catch(sendErrorToTest);
+}
+
 function permissionState() {
   navigator.serviceWorker.ready.then(function(swRegistration) {
     return swRegistration.pushManager.permissionState(pushSubscriptionOptions)