Add benchmark that tests garbage collector and idle time handler.

tools/perf/benchmarks/memory.py

 # Copyright 2013 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 benchmark
 
 from measurements import memory
 import page_sets
 
 
@@ skipping 23 matching lines @@
 
   test = memory.Memory
   page_set = page_sets.Top7StressPageSet
 
   def CustomizeBrowserOptions(self, options):
     options.AppendExtraBrowserArgs(['--enable-slimming-paint'])
 
   @classmethod
   def Name(cls):
     return 'memory.top_7_stress_slimming_paint'
+
+
+class MemoryIdleMultiTab(benchmark.Benchmark):
+  """Use (recorded) real world web sites and measure memory consumption
+  with many tabs and idle times. """
+  test = memory.Memory
+  page_set = page_sets.IdleMultiTabCasesPageSet
+
+  def CustomizeBrowserOptions(self, options):
+    # This benchmark opens tabs from JavaScript, which does not work
+    # with popup-blocking enabled.
+    options.AppendExtraBrowserArgs(['--disable-popup-blocking'])
+
+  @classmethod
+  def Name(cls):
+    return 'memory.idle_multi_tab'