Three way experiment for "Show saved copy" button.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index f6b24f35fa9981228cb6a33a51424f801ac9b9d2..dce08e8468477e91b64c3a827c644dc536d80d61 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -53945,9 +53945,9 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1" label="Reload Button Shown"/>
   <int value="2" label="Reload Button Clicked"/>
   <int value="3" label="Reload Button Click Load Error"/>
-  <int value="4" label="Load Stale Button Shown"/>
-  <int value="5" label="Load Stale Button Clicked"/>
-  <int value="6" label="Load Stale Button Click Load Error"/>
+  <int value="4" label="Show Saved Copy Button Shown"/>

[Alexei Svitkine (slow), 2015/03/02 20:16:43]

Just to confirm, this is changing the label of the same action? i.e. Load Stale
and Show Saved Copy is the same UI - just a different name for it in the code?
If so, this is fine.

If it's a different button, then you should add new values instead of replacing
these. 

[megjablon, 2015/03/02 20:22:04]

Yep, this is just a name change, not a new button.

+  <int value="5" label="Show Saved Copy Button Clicked"/>
+  <int value="6" label="Show Saved Copy Button Click Load Error"/>
   <int value="7" label="More Button Clicked"/>
   <int value="8" label="Browser Initiated Reload"/>
 </enum>