Add UMA metrics for Bookmark widgets.

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 eeaf22ca3805534f1c3e5c0a9c0c114919a38a42..3361250a7fc7f92041319c4dcde1914ff811c583 100644
--- a/tools/metrics/rappor/rappor.xml
+++ b/tools/metrics/rappor/rappor.xml
@@ -339,6 +339,26 @@ components/rappor/rappor_service.cc.
   </summary>
 </rappor-metric>
 
+<rappor-metric name="Launch.HomeScreenSource.BookmarkNavigatorWidget"
+    type="ETLD_PLUS_ONE">
+  <owner>aurimas@chromium.org</owner>
+  <summary>
+    The eTLD+1 of a URL that was launched from the Chrome's bookmark navigator
+    widget. This explicitly does not count relaunches via the Android Recents
+    menu.
+  </summary>
+</rappor-metric>
+
+<rappor-metric name="Launch.HomeScreenSource.BookmarkShortcutWidget"
+    type="ETLD_PLUS_ONE">
+  <owner>aurimas@chromium.org</owner>
+  <summary>
+    The eTLD+1 of a URL that was launched from the Chrome's bookmark shortcut
+    widget. 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>