Add benchmark that imitates news reading.

tools/perf/page_sets/system_health/system_health_story.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.
+
+import logging
+
+from page_sets.system_health import platforms
+
+from telemetry.core import discover
+from telemetry.page import page
+
+
+_DUMP_WAIT_TIME = 3
+
+
+class SystemHealthStory(page.Page):
+  """Abstract base class for System Health user stories."""
+
+  # The full name of a single page story has the form CASE:GROUP:PAGE (e.g.
+  # 'load:search:google').
+  NAME = NotImplemented
+  URL = NotImplemented
+  SUPPORTED_PLATFORMS = platforms.ALL_PLATFORMS
+
+  def __init__(self, story_set, take_memory_measurement):
+    case, group, _ = self.NAME.split(':')
+    super(SystemHealthStory, self).__init__(
+        page_set=story_set, name=self.NAME, url=self.URL,
+        credentials_path='../data/credentials.json',
+        grouping_keys={'case': case, 'group': group})
+    self._take_memory_measurement = take_memory_measurement
+
+  def _Measure(self, action_runner):
+    if not self._take_memory_measurement:
+      return
+    # TODO(petrcermak): This method is essentially the same as
+    # MemoryHealthPage._TakeMemoryMeasurement() in memory_health_story.py.
+    # Consider sharing the common code.
+    action_runner.Wait(_DUMP_WAIT_TIME)
+    action_runner.ForceGarbageCollection()
+    action_runner.Wait(_DUMP_WAIT_TIME)
+    tracing_controller = action_runner.tab.browser.platform.tracing_controller
+    if not tracing_controller.is_tracing_running:
+      return  # Tracing is not running, e.g., when recording a WPR archive.
+    if not action_runner.tab.browser.DumpMemory():
+      logging.error('Unable to get a memory dump for %s.', self.name)
+
+  def _Login(self, action_runner):
+    pass
+
+  def _DidLoadDocument(self, action_runner):
+    pass
+
+  def RunNavigateSteps(self, action_runner):
+    self._Login(action_runner)
+    super(SystemHealthStory, self).RunNavigateSteps(action_runner)
+
+  def RunPageInteractions(self, action_runner):
+    action_runner.tab.WaitForDocumentReadyStateToBeComplete()
+    self._DidLoadDocument(action_runner)
+    self._Measure(action_runner)
+
+
+def IterAllStoryClasses(module, base_class):
+  # Sort the classes by their names so that their order is stable and
+  # deterministic.
+  for unused_cls_name, cls in sorted(discover.DiscoverClassesInModule(
+      module=module,
+      base_class=base_class,
+      index_by_class_name=True).iteritems()):
+    yield cls