Add chrome://slow for enabling performance tracing for feedback reports.

chrome/app/chromeos_strings.grdp

Index: chrome/app/chromeos_strings.grdp
diff --git a/chrome/app/chromeos_strings.grdp b/chrome/app/chromeos_strings.grdp
index 5af01605f6cc085556c680544ddccc3b4f10064c..26666933d505e9f94d9e5a8c53c5c4d842dd72dc 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -1627,6 +1627,19 @@ Press any key to continue exploring.
     This SIM card is disabled and cannot be used. Please contact your service provider for a replacement.
   </message>
 
+  <message name="IDS_SLOW_DISABLE" desc="">

[Lei Zhang, 2013/08/09 21:00:01]

your message should have descriptions for the translators.

[Zachary Kuznia, 2013/08/09 21:52:20]

Done.

+    Disable performance data collection
+  </message>
+  <message name="IDS_SLOW_ENABLE" desc="">
+    Enable performance data collection
+  </message>
+  <message name="IDS_SLOW_DESCRIPTION" desc="">
+    Enabling collection of performance data will help Google improve the system over time. No data is sent until you file a feedback report (Alt-Shift-I) and include performance data. You can return to this screen to disable collection at any time.
+  </message>
+  <message name="IDS_SLOW_WARNING" desc="">
+    <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>Note:<ph name="END_BOLD">&lt;/strong&gt;</ph> only enable if you know what you are doing or if you have been asked to do so, as collection of data will affect performance.
+  </message>
+
   <message name="IDS_EULA_BACK_BUTTON" desc="Back button shown on EULA screen.">
     Back
   </message>