Add rappor metrics by intent source for launches from home screen.

tools/metrics/rappor/rappor.xml

Index: tools/metrics/rappor/rappor.xml
diff --git a/tools/metrics/rappor/rappor.xml b/tools/metrics/rappor/rappor.xml
index a0bc7fc30f11a73ec5c648a9d4a3a681fa964eb8..4e46e9274ff490ccb8332e51c33141937a1a5e68 100644
--- a/tools/metrics/rappor/rappor.xml
+++ b/tools/metrics/rappor/rappor.xml
@@ -310,6 +310,34 @@ components/rappor/rappor_service.cc.
   </summary>
 </rappor-metric>
 
+<rappor-metric name="Launch.HomeScreenSource.AddToHomeScreen"
+    type="ETLD_PLUS_ONE">
+  <owner>dominickn@chromium.org</owner>
+  <summary>
+    The eTLD+1 of a URL that was launched from the Android Home screen via an
+    intent added from an add to homescreen menu item. This explicitly does not
+    count relaunches via the Android Recents menu.
+  </summary>
+</rappor-metric>
+
+<rappor-metric name="Launch.HomeScreenSource.AppBanner" type="ETLD_PLUS_ONE">
+  <owner>dominickn@chromium.org</owner>
+  <summary>
+    The eTLD+1 of a URL that was launched from the Android Home screen via an
+    intent added from an app banner. This explicitly does not count relaunches
+    via the Android Recents menu.
+  </summary>
+</rappor-metric>
+
+<rappor-metric name="Launch.HomeScreenSource.Unknown" type="ETLD_PLUS_ONE">
+  <owner>dominickn@chromium.org</owner>
+  <summary>
+    The eTLD+1 of a URL that was launched from the Android Home screen via an
+    intent added from an unknown source. This explicitly does not count
+    relaunches via the Android Recents menu.
+  </summary>
+</rappor-metric>
+
 <rappor-metric name="Media.OriginUrl.EME" type="ETLD_PLUS_ONE">
   <owner>xhwang@chromium.org</owner>
   <summary>