Add favicon and publisher name to snippet cards

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 57da90f5dfd22a4ed9af769d7dd0d127eba2bbc3..97f04c9572ea9c353e51f2dbf9d87569b24e5903 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -33224,6 +33224,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NewTabPage.Snippets.IncompleteSnippetsAfterFetch"
+    enum="Boolean">
+  <owner>maybelle@chromium.org</owner>
+  <summary>
+    Whether we discarded any of the snippets after fetching them due to having
+    incomplete metadata.
+  </summary>
+</histogram>
+
 <histogram name="NewTabPage.Snippets.Interactions" enum="SnippetsInteractions">
   <owner>knn@chromium.org</owner>
   <summary>
@@ -33240,6 +33249,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NewTabPage.Snippets.NumIncompleteSnippets" units="snippets">
+  <owner>maybelle@chromium.org</owner>
+  <summary>
+    The number of snippets that we discard per fetch due to having incomplete
+    data.
+  </summary>
+</histogram>
+
 <histogram name="NewTabPage.SuggestedSite">
   <obsolete>
     Deprecated 2016-02 (and not recorded for some time before that).