[Telemetry] Port page cycler to Telemetry.

tools/perf/perf_tools/page_cycler.py

Index: tools/perf/perf_tools/page_cycler.py
diff --git a/tools/perf/perf_tools/page_cycler.py b/tools/perf/perf_tools/page_cycler.py
new file mode 100644
index 0000000000000000000000000000000000000000..6de0af88c821fdc6211095a941c4211fcf07d61c
--- /dev/null
+++ b/tools/perf/perf_tools/page_cycler.py
@@ -0,0 +1,38 @@
+# Copyright (c) 2012 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 telemetry import multi_page_benchmark
+from telemetry import util
+
+MEMORY_HISTOGRAMS = [
+    {'name': 'V8.MemoryExternalFragmentationTotal', 'units': 'percent'},
+    {'name': 'V8.MemoryHeapSampleTotalCommitted', 'units': 'kb'},
+    {'name': 'V8.MemoryHeapSampleTotalUsed', 'units': 'kb'}]
+
+class PageCycler(multi_page_benchmark.MultiPageBenchmark):
+  def CustomizeBrowserOptions(self, options):
+    options.AppendExtraBrowserArg('--dom-automation')
+    options.AppendExtraBrowserArg('--js-flags=--expose_gc')
+
+  def MeasurePage(self, _, tab, results):
+    def _IsDone():
+      return tab.page.GetCookieByName('__pc_done') == '1'
+    util.WaitFor(_IsDone, 1200, poll_interval=5)
+    print 'Pages: [%s]' % tab.page.GetCookieByName('__pc_pages')
+
+    # TODO(tonyg): Get IO and memory statistics.
+
+    for histogram in MEMORY_HISTOGRAMS:
+      name = histogram['name']
+      data = tab.runtime.Evaluate(
+          'window.domAutomationController.getHistogram("%s")' % name)
+      results.Add(name, histogram['units'], data, data_type='histogram')
+
+    def _IsNavigatedToReport():
+      return tab.page.GetCookieByName('__navigated_to_report') == '1'
+    util.WaitFor(_IsNavigatedToReport, 60, poll_interval=5)
+    timings = tab.runtime.Evaluate('__get_timings()').split(',')
+    results.Add('t', 'ms', [int(t) for t in timings], chart_name='times')
+
+# TODO(tonyg): Add version that runs with extension profile.