Add perf tests for starting Chrome with URL

tools/telemetry/telemetry/page/actions/set_startup_url.py

Index: tools/telemetry/telemetry/page/actions/set_startup_url.py
diff --git a/tools/telemetry/telemetry/page/actions/set_startup_url.py b/tools/telemetry/telemetry/page/actions/set_startup_url.py
new file mode 100644
index 0000000000000000000000000000000000000000..dba45d56ce59e8b4febe72a6ec3934293a9cfb08
--- /dev/null
+++ b/tools/telemetry/telemetry/page/actions/set_startup_url.py
@@ -0,0 +1,20 @@
+# Copyright 2013 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.
+
+from telemetry.page.actions import page_action
+
+class SetStartupUrlAction(page_action.PageAction):
+  """ Sets the URL to be loaded when the browser starts
+
+  This action sets a URL to be added to the command line or Android Intent when
+  the browser is started. It only really makes sense for tests that restart
+  the browser for each page.
+  """
+
+  def RunAction(self, page, tab, previous_action):
+    pass
+
+  def CustomizeBrowserOptionsForSinglePage(self, options):
+    assert hasattr(self,'startup_url')
+    options.browser_options.startup_url = self.startup_url