Add benchmark that tests garbage collector and idle time handler.

tools/perf/page_sets/idle_multi_tab_cases.py

+# Copyright 2015 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 os
+
+from telemetry.page import page_set as page_set_module
+
+from page_sets import top_pages
+from page_sets import top_7_stress
+
+
+def _SpawnTab(action_runner):
+  return action_runner.EvaluateJavaScript('__telemetry_spawn_tab()')
+
+
+def _CloseTab(action_runner, tab):
+  action_runner.EvaluateJavaScript('__telemetry_close_tab(' + str(tab) + ')')
+
+
+def _CreateIdleMultiTabPageClass(base_page_cls, base_js):
+  class DerivedIdleMultiTabPage(base_page_cls):  # pylint: disable=W0232
+
+    def RunPageInteractions(self, action_runner):
+      MAX_TABS = 10
+      action_runner.ExecuteJavaScript(base_js)
+      tabs = {}
+      # Slowly open tabs.
+      for tab in xrange(MAX_TABS):
+        tabs[tab] = _SpawnTab(action_runner)
+        action_runner.Wait(1)
+      action_runner.Wait(20)
+      # Slowly close tabs.
+      for tab in xrange(MAX_TABS):
+        _CloseTab(action_runner, tabs[tab])
+        action_runner.Wait(1)
+      action_runner.Wait(30)
+      # Quickly open tabs.
+      for tab in xrange(MAX_TABS):
+        tabs[tab] = _SpawnTab(action_runner)
+      action_runner.Wait(20)
+      # Quickly close tabs.
+      for tab in xrange(MAX_TABS):
+        _CloseTab(action_runner, tabs[tab])
+      action_runner.Wait(30)
+  return DerivedIdleMultiTabPage
+
+
+class IdleMultiTabCasesPageSet(page_set_module.PageSet):
+
+  """ Pages for testing GC efficiency on idle pages. """
+
+  def __init__(self):
+    super(IdleMultiTabCasesPageSet, self).__init__(
+        user_agent_type='desktop',
+        archive_data_file='data/top_25.json',
+        bucket=page_set_module.PARTNER_BUCKET)
+    with open(os.path.join(os.path.dirname(__file__),
+              'idle_multi_tab_cases.js')) as f:
+      base_js = f.read()
+    pages = [
+      top_pages.GoogleDocPage,
+      top_7_stress.GmailPage,
+      top_7_stress.GooglePlusPage,
+    ]
+    for page in pages:
+      self.AddUserStory(_CreateIdleMultiTabPageClass(page, base_js)(self))