diff -r 000000000000 -r 6474c204b198 browser/metro/base/tests/mochiperf/browser_deck_01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/metro/base/tests/mochiperf/browser_deck_01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+function test() {
+  runTests();
+}
+
+gTests.push({
+  desc: "deck offset",
+  run: function run() {
+    yield addTab("about:mozilla");
+    yield hideContextUI();
+    yield hideNavBar();
+    yield waitForMs(3000);
+
+    let shiftDataSet = new Array();
+    let paintDataSet = new Array();
+    let stopwatch = new StopWatch();
+    let win = Browser.selectedTab.browser.contentWindow;
+    let domUtils = win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+
+    for (let idx = 0; idx < 10; idx++) {
+      let recordingHandle = domUtils.startFrameTimeRecording();
+      stopwatch.start();
+      let promise = waitForEvent(window, "MozDeckOffsetChanged");
+      ContentAreaObserver.shiftBrowserDeck(300);
+      yield promise;
+      promise = waitForEvent(window, "MozDeckOffsetChanged");
+      ContentAreaObserver.shiftBrowserDeck(0);
+      yield promise;
+      stopwatch.stop();
+      yield waitForMs(500);
+      let intervals = domUtils.stopFrameTimeRecording(recordingHandle);
+      shiftDataSet.push(stopwatch.time());
+      paintDataSet.push(intervals.length);
+    }
+    
+    PerfTest.declareTest("ecb5fbec-0b3d-490f-8d4a-13fa8963e54a",
+                         "shift browser deck", "browser", "ux",
+                         "Triggers multiple SKB deck shifting operations using an offset " +
+                         "value of 300px. Measures total time in milliseconds for a up/down " +
+                         "shift operation plus the total number of frames. Strips outliers.");
+    let shiftAverage = PerfTest.computeAverage(shiftDataSet, { stripOutliers: true });
+    let paintAverage = PerfTest.computeAverage(paintDataSet, { stripOutliers: true });
+    PerfTest.declareNumericalResults([
+      { value: shiftAverage, desc: "msec" },
+      { value: paintAverage, desc: "frame count" },
+    ]);
+  }
+});
+