Adding a test for measuring memory usage.

tools/perf/perf_tools/memory_benchmark.py

Index: tools/perf/perf_tools/memory_benchmark.py
diff --git a/tools/perf/perf_tools/memory_benchmark.py b/tools/perf/perf_tools/memory_benchmark.py
new file mode 100644
index 0000000000000000000000000000000000000000..5f69968d946d388b592bd5687004f21d2c9bcc32
--- /dev/null
+++ b/tools/perf/perf_tools/memory_benchmark.py
@@ -0,0 +1,49 @@
+# 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.
+import copy
+
+from chrome_remote_control import interaction
+from chrome_remote_control import multi_page_benchmark
+from chrome_remote_control import test_helper_interaction #pylint: disable=W0611
+
+MEMORY_HISTOGRAMS = [
+    {'name': 'V8.MemoryExternalFragmentationTotal', 'units': 'percent'},
+    {'name': 'V8.MemoryHeapSampleTotalCommitted', 'units': 'kb'},
+    {'name': 'V8.MemoryHeapSampleTotalUsed', 'units': 'kb'}]
+
+class MemoryBenchmark(multi_page_benchmark.MultiPageBenchmark):
+  def __init__(self):
+    super(MemoryBenchmark, self).__init__()
+    self._interactions = []
+    self._results = {}
+
+  @staticmethod
+  def GetMemoryHistograms(tab, results):
+    for histogram in MEMORY_HISTOGRAMS:
+      name = histogram['name']
+      data = tab.runtime.Evaluate(
+          'window.domAutomationController.getHistogram("%s")' % name)
+      results.AddHistogram(name, histogram['units'], data)
+
+  def CustomizeBrowserOptions(self, options):
+    options.extra_browser_args.append('--dom-automation')
+
+  def DoNextInteraction(self, page, tab):
+    if not self._interactions:
+      return False
+    data = self._interactions[0]
+    self._interactions = self._interactions[1:]
+    i = interaction.FindClassWithName(data['type'])(data)
+    i.PerformInteraction(page, tab, self)
+    return True
+
+  def DidPerformInteraction(self, _, page, tab):
+    if not self.DoNextInteraction(page, tab):
+      self.GetMemoryHistograms(tab, self._results)
+
+  def MeasurePage(self, page, tab, results):
+    self._interactions = copy.copy(page.interactions)
+    self._results = results
+    tab.WaitForDocumentReadyStateToBeComplete()
+    self.DoNextInteraction(page, tab)