Add one benchmark to get CPU and memory usage without MR.

chrome/test/media_router/telemetry/benchmarks/pagesets/media_router_perf_pages.py

Index: chrome/test/media_router/telemetry/benchmarks/pagesets/media_router_perf_pages.py
diff --git a/chrome/test/media_router/telemetry/benchmarks/pagesets/media_router_perf_pages.py b/chrome/test/media_router/telemetry/benchmarks/pagesets/media_router_perf_pages.py
index 8c6555638a5aaf50dcbf85084c80252afe4d4084..d4a245adba614449c2e7894fb66f08adfab554f3 100644
--- a/chrome/test/media_router/telemetry/benchmarks/pagesets/media_router_perf_pages.py
+++ b/chrome/test/media_router/telemetry/benchmarks/pagesets/media_router_perf_pages.py
@@ -185,3 +185,12 @@ class MediaRouterCPUMemoryPageSet(story.StorySet):
     self.AddStory(CastIdlePage(self))
     self.AddStory(CastFlingingPage(self))
     self.AddStory(CastMirroringPage(self))
+
+
+class CPUMemoryPageSet(story.StorySet):
+  """Pageset to get baseline CPU and memory usage."""
+
+  def __init__(self):
+    super(CPUMemoryPageSet, self).__init__(
+        cloud_storage_bucket=story.PARTNER_BUCKET)
+    self.AddStory(CastIdlePage(self))