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

Index: chrome/test/media_router/telemetry/benchmarks/media_router_benchmark.py
diff --git a/chrome/test/media_router/telemetry/benchmarks/media_router_benchmark.py b/chrome/test/media_router/telemetry/benchmarks/media_router_benchmark.py
index e8d1b692d26933020caf4e216223f81de4860a7b..1dbcb698812eb7b5f59ad08ed17f35aa7026ed8d 100644
--- a/chrome/test/media_router/telemetry/benchmarks/media_router_benchmark.py
+++ b/chrome/test/media_router/telemetry/benchmarks/media_router_benchmark.py
@@ -86,3 +86,30 @@ class CPUMemoryCastBenckmark(_BaseCastBenchmark):
   @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'