Record metric of geo permission before and after showing the disclosure.

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 3c5a1e7a27f2d541a1ffe549b60139e8178fa8c3..4e8cf4ec6c044bb6e3ac512041bd832e798a3264 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -19001,6 +19001,22 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GeolocationDisclosure.PostDisclosurePermission">
+  <owner>benwells@chromium.org</owner>
+  <summary>
+    Records the geolocation permission for the default search engine's origin
+    after the search geolocation disclosure has been shown.

[raymes, 2016/11/22 01:54:00]

It could be useful to note this is only recorded once per client and also that
it's recorded after the disclosure has been shown and won't be shown again.

[benwells, 2016/11/22 02:23:08]

Done.

+  </summary>
+</histogram>
+
+<histogram name="GeolocationDisclosure.PreDisclosurePermission">
+  <owner>benwells@chromium.org</owner>
+  <summary>
+    Records the geolocation permission for the default search engine's origin
+    before the search geolocation disclosure has been shown.

[raymes, 2016/11/22 01:54:00]

nit: similarly here

[benwells, 2016/11/22 02:23:07]

Done.

+  </summary>
+</histogram>
+
 <histogram name="GoogleNow.Card.Button.Clicked0" enum="GoogleNowCardTypeId">
   <owner>robliao@chromium.org</owner>
   <owner>skare@chromium.org</owner>