Add perf tests for starting Chrome with URL

tools/telemetry/telemetry/page/page_runner.py

Index: tools/telemetry/telemetry/page/page_runner.py
diff --git a/tools/telemetry/telemetry/page/page_runner.py b/tools/telemetry/telemetry/page/page_runner.py
index 4d86f62b4ef7d8b059f13463294634c3641d1848..b9091c11ae98bba495a9083ec38334ee7aef7cd2 100644
--- a/tools/telemetry/telemetry/page/page_runner.py
+++ b/tools/telemetry/telemetry/page/page_runner.py
@@ -211,6 +211,11 @@ def _PrepareAndRunPage(test, page_set, expectations, finder_options,
   tries = 3
   while tries:
     try:
+      if test.AlwaysRestartBrowserForEachRun():
+      # If we are restarting the browser for each page customize the per page
+      # options just before starting the browser

[jeremy, 2013/12/15 13:03:36]

nit: indent comment 2 spaces.

[aberent, 2013/12/16 17:07:43]

Done.

+        test.CustomizeBrowserOptionsForPage(page,
+                                            possible_browser.finder_options)
       state.StartBrowser(test, page_set, page, possible_browser,
                          credentials_path, page.archive_path)
 
@@ -298,8 +303,12 @@ def Run(test, page_set, expectations, finder_options):
   if page_set.user_agent_type:
     browser_options.browser_user_agent_type = page_set.user_agent_type
 
-  for page in pages:
-    test.CustomizeBrowserOptionsForPage(page, possible_browser.finder_options)
+  if not test.AlwaysRestartBrowserForEachRun():

[jeremy, 2013/12/15 13:03:36]

Does the above if mean that we restart the browser for each page individually
rather than each run?

[aberent, 2013/12/16 17:07:43]

Yes. Renamed to make this clearer.

+  # If we are restarting the browser for each page then we want to
+  # customize the browser options for one page at a time.
+    for page in pages:
+      test.CustomizeBrowserOptionsForPage(page,
+                                          possible_browser.finder_options)
   if finder_options.profiler:
     profiler_class = profiler_finder.FindProfiler(finder_options.profiler)
     profiler_class.CustomizeBrowserOptions(possible_browser.browser_type,