[Telemetry] Add a page set option to use all cold page loads.

tools/telemetry/telemetry/core/browser.py

Index: tools/telemetry/telemetry/core/browser.py
diff --git a/tools/telemetry/telemetry/core/browser.py b/tools/telemetry/telemetry/core/browser.py
index b483fbd1c5ab5563b4b46f866ccc84b2376a8bcc..44c5b706bec176b379e453b928a64e783089b073 100644
--- a/tools/telemetry/telemetry/core/browser.py
+++ b/tools/telemetry/telemetry/core/browser.py
@@ -225,6 +225,14 @@ class Browser(object):
     """Returns the result of the trace, as TraceResult object."""
     return self._browser_backend.GetTraceResultAndReset()
 
+  def CloseConnections(self):

[nduca, 2013/06/06 22:49:04]

i recall asking if these were supported on all browsers. are they? and will
these work if you dont pass the right arguments to the browser? how do you
guarantee it..?

[tonyg, 2013/06/20 02:42:29]

I switched this to use devtools' cache clearing method. If devtools tells us it
isn't supported, I raise an exception.

+    """Closes all TCP sockets held open by the browser."""
+    self._browser_backend.CloseConnections()
+
+  def ClearCache(self):
+    """Clears all persistent state in the browser."""
+    self._browser_backend.ClearCache()
+
   def Close(self):
     """Closes this browser."""
     self._platform.SetFullPerformanceModeEnabled(False)