Prevent duplicate navigation to debug URLs from Telemetry.

tools/telemetry/telemetry/core/backends/chrome/system_info_backend.py

Index: tools/telemetry/telemetry/core/backends/chrome/system_info_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/system_info_backend.py b/tools/telemetry/telemetry/core/backends/chrome/system_info_backend.py
index 3a8a08c40470244c67fd2938ca431b3353c48dbc..00a78a70349193e2012439c7f6c9d402100c6070 100644
--- a/tools/telemetry/telemetry/core/backends/chrome/system_info_backend.py
+++ b/tools/telemetry/telemetry/core/backends/chrome/system_info_backend.py
@@ -2,7 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from telemetry import decorators
 from telemetry.core import camel_case
 from telemetry.core import system_info
 from telemetry.core.backends.chrome import inspector_websocket
@@ -12,7 +11,6 @@ class SystemInfoBackend(object):
   def __init__(self, devtools_port):
     self._port = devtools_port
 
-  @decorators.Cache

[tonyg, 2014/07/25 20:47:35]

Let's pull the Telemetry change into a separate CL that also includes a unittest
that demonstrates the fix for the bug.

[Ken Russell (switch to Gerrit), 2014/07/25 21:21:36]

Talking with Victor about this. While I completely agree that a separate
unittest is a good idea -- and we've figured out how to write it -- I would like
to propose that we include that test with this patch rather than landing it
separately. That will double the time for making this fix, which we'd like to
land ASAP -- it will clear up flakiness currently seen on the GPU bots.

   def GetSystemInfo(self, timeout=10):
     req = {'method': 'SystemInfo.getInfo'}
     websocket = inspector_websocket.InspectorWebsocket()