Stop the existing session if it exists before start a new session and add mirroring scenario for cp…

chrome/test/media_router/telemetry/benchmarks/media_router_benchmark.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 os
 from telemetry import benchmark
 from core import perf_benchmark
 from core import path_util
 from telemetry.timeline import tracing_category_filter
 from telemetry.web_perf import timeline_based_measurement
@@ skipping 68 matching lines @@
   options = {'page_repeat': 1}
 
   page_set = media_router_perf_pages.MediaRouterCPUMemoryPageSet
 
   def CreatePageTest(self, options):
     return media_router_measurements.MediaRouterCPUMemoryTest()
 
   @classmethod
   def Name(cls):
     return 'media_router.cpu_memory'
+
+
+class CPUMemoryBenckmark(perf_benchmark.PerfBenchmark):
+  options = {'page_repeat': 1}
+
+  page_set = media_router_perf_pages.CPUMemoryPageSet
+
+  def SetExtraBrowserOptions(self, options):
+    options.clear_sytem_cache_for_browser_and_profile_on_start = True
+    # This flag is required to enable the communication between the page and
+    # the test extension.
+    options.disable_background_networking = False
+
+    # TODO: find a better way to find extension location.
+    options.AppendExtraBrowserArgs([
+        '--load-extension=' + 
+             os.path.join(path_util.GetChromiumSrcDir(), 'out',
+             'Release', 'media_router', 'test_extension'),
+        '--enable-stats-collection-bindings'
+    ])
+
+  def CreatePageTest(self, options):
+    return media_router_measurements.MediaRouterCPUMemoryTest()
+
+  @classmethod
+  def Name(cls):
+    return 'media_router.cpu_memory.no_media_router'