Use whether a query is from the app list to determine the RLZ parameter.

chrome/browser/search_engines/template_url.h

Index: chrome/browser/search_engines/template_url.h
diff --git a/chrome/browser/search_engines/template_url.h b/chrome/browser/search_engines/template_url.h
index 37c5c137bb664dd34359be6ff5835c03987bc295..d82db4d626fb714a6e8274c0e7c59ca40ffb371f 100644
--- a/chrome/browser/search_engines/template_url.h
+++ b/chrome/browser/search_engines/template_url.h
@@ -133,6 +133,10 @@ class TemplateURLRef {
     // disabled by google.com preferences. See comments on
     // chrome::ForceInstantResultsParam().
     bool force_instant_results;
+
+    // True if the search was made using the app list search box. Otherwise, the
+    // search was made using the omnibox.
+    bool from_app_list;
   };
 
   TemplateURLRef(TemplateURL* owner, Type type);