SimpleGeolocation should support sending WiFi AP data.

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 bbee64d70d183bf7aa5857d22bf6262ed2ab1323..88fa754cc8494139d93b9ddd78be329ef9ca1dde 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -47764,6 +47764,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Events in reqests processing of IP-based SimpleGeolocation.</summary>
 </histogram>
 
+<histogram name="SimpleGeolocation.Request.HasWiFiAccessPoints"
+    enum="SimpleGeolocationRequestHasWiFiAccessPoints">
+  <owner>alemate@chromium.org</owner>
+  <summary>
+    This boolean histogram counts SimpleGeolocationRequests carrying nonzero
+    number of WiFi access points.
+  </summary>
+</histogram>
+
 <histogram name="SimpleGeolocation.Request.ResponseCode"
     enum="HttpResponseCode">
   <owner>alemate@chromium.org</owner>
@@ -80699,6 +80708,11 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="4" label="Response malformed"/>
 </enum>
 
+<enum name="SimpleGeolocationRequestHasWiFiAccessPoints" type="int">
+  <int value="0" label="No WiFi data in request."/>
+  <int value="1" label="WiFi data present."/>
+</enum>
+
 <enum name="SimpleGeolocationRequestResult" type="int">
   <int value="0" label="Success"/>
   <int value="1" label="Failure"/>