Add loading mobile benchmark (but disable it)

tools/perf/benchmarks/loading.py

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from core import perf_benchmark
+import page_sets
+
+from benchmarks import page_cycler_v2
+from telemetry import benchmark
+from telemetry.page import cache_temperature
+
+
+@benchmark.Disabled('all')  # crbug.com/654215
+class LoadingMobile(perf_benchmark.PerfBenchmark):
+  """ A benchmark measuring loading performance of mobile sites. """
+
+  options = {'pageset_repeat': 2}
+
+  def CreateTimelineBasedMeasurementOptions(self):
+    return page_cycler_v2.TimelineBasedMeasurementOptionsForLoadingMetric()
+
+  @classmethod
+  def Name(cls):
+    return 'loading.mobile'
+
+  def CreateStorySet(self, options):
+    return page_sets.LoadingMobileStorySet(cache_temperatures=[
+          cache_temperature.ANY])