[Telemetry] Utilize CreatePageSet for benchmarks with one page set.

tools/perf/perf_tools/kraken.py

Index: tools/perf/perf_tools/kraken.py
diff --git a/tools/perf/perf_tools/kraken.py b/tools/perf/perf_tools/kraken.py
index 2d2086d5599399f0df2be1a62636244757257251..e19da487b2da7eadfe55e7f84bc5a333b2933b4f 100644
--- a/tools/perf/perf_tools/kraken.py
+++ b/tools/perf/perf_tools/kraken.py
@@ -2,13 +2,26 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+"""Runs Mozilla's Kraken JavaScript benchmark."""
+
+import os
+
 from telemetry.core import util
 from telemetry.page import page_measurement
+from telemetry.page import page_set
 
 def _Mean(l):
   return float(sum(l)) / len(l) if len(l) > 0 else 0.0
 
 class Kraken(page_measurement.PageMeasurement):
+  def CreatePageSet(self, options):
+    return page_set.PageSet.FromDict({
+        'archive_data_file': '../data/kraken.json',
+        'pages': [
+          { 'url': 'http://krakenbenchmark.mozilla.org/kraken-1.1/driver.html' }
+          ]
+        }, os.path.abspath(__file__))
+
   def MeasurePage(self, _, tab, results):
     js_is_done = """
 document.title.indexOf("Results") != -1 && document.readyState == "complete"