Geolocation: add UMA histograms for events and response codes.

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 78ddae6d05f1f1581dd655b7f28ff1aa3ede9603..bd0b6cdc0952d4f8e8b19b3aba170fccb0d6ddde 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4853,6 +4853,15 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Geolocation.NetworkLocationRequest.Event"
+    enum="NetworkLocationRequestEvent">
+  <summary>Events in NetworkLocationRequest.</summary>
+</histogram>
+
+<histogram name="Geolocation.NetworkLocationRequest.ResponseCode" units="code">
+  <summary>Http response codes in NetworkLocationRequest.</summary>
+</histogram>
+
 <histogram name="GoogleNow.Event" enum="GoogleNowEvent">
   <summary>Events in Google Now component extension.</summary>
 </histogram>
@@ -24098,6 +24107,16 @@ other types of suffix sets.
   <int value="1" label="User Disconnect"/>
 </enum>
 
+<enum name="NetworkLocationRequestEvent" type="int">
+  <int value="0" label="REQUEST_START"/>
+  <int value="1" label="REQUEST_CANCEL"/>
+  <int value="2" label="RESPONSE_SUCCESS"/>
+  <int value="3" label="RESPONSE_NOT_OK"/>
+  <int value="4" label="RESPONSE_EMPTY"/>
+  <int value="5" label="RESPONSE_MALFORMED"/>
+  <int value="6" label="RESPONSE_INVALID_FIX"/>
+</enum>
+
 <enum name="NetworkPhyModeType" type="int">
   <int value="0" label="UNDEF"/>
   <int value="1" label="802.11a"/>