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 83db601a945dd7665564f5fd87d09cd197867ac2..f103d537d0b984b0066acc28129d63d28511e9a4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -52477,6 +52477,25 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="ServiceWorker.ForeignFetch.OriginCount">
+  <owner>mek@chromium.org</owner>
+  <summary>
+    The number of origins a particular service worker with foreign fetch
+    registrations will intercept fetches from. A value of zero indicates that
+    the foreign fetch service worker intercepts requests from any origin.
+    Recorded at the end of a successful install event, if the service worker
+    registered for foreign fetch.

[Mark P, 2016/08/16 22:27:14]

Can you add something to this effect to the end of the description?
A service worker that registers for foreign fetch must either register at least
one origin to intercept or intercept all origins.

[Marijn Kruisselbrink, 2016/08/17 19:21:33]

Done

+  </summary>
+</histogram>
+
+<histogram name="ServiceWorker.ForeignFetch.ScopeCount">
+  <owner>mek@chromium.org</owner>
+  <summary>
+    The number of foreign fetch scopes a particular service worker registered
+    for. Recorded at the end of every successful install event.

[Mark P, 2016/08/16 22:27:14]

Will this always be 0 for workers with no foreign fetch registration?  If so,
that might be a good example to add.

[Marijn Kruisselbrink, 2016/08/17 19:21:33]

Done

+  </summary>
+</histogram>
+
 <histogram name="ServiceWorker.ForeignFetchEvent.Fallback.Time" units="ms">
   <owner>mek@chromium.org</owner>
   <summary>