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

chrome/browser/autocomplete/base_search_provider.h

Index: chrome/browser/autocomplete/base_search_provider.h
diff --git a/chrome/browser/autocomplete/base_search_provider.h b/chrome/browser/autocomplete/base_search_provider.h
index 86eab7481c9113964990f5029f67194915455612..0ee06ae83e9da6ec2d6cd735ba43288744a1e4e6 100644
--- a/chrome/browser/autocomplete/base_search_provider.h
+++ b/chrome/browser/autocomplete/base_search_provider.h
@@ -73,6 +73,9 @@ class BaseSearchProvider : public AutocompleteProvider,
     return field_trial_triggered_in_session_;
   }
 
+  // Sets this as being in the app list.

[Peter Kasting, 2014/04/09 02:12:33]

Nit: No need for a comment here as long as the one on the member below is clear.

[Sam McNally, 2014/04/09 05:33:44]

Done.

+  void set_in_app_list() { in_app_list_ = true; }
+
  protected:
   // The following keys are used to record additional information on matches.
 
@@ -327,6 +330,7 @@ class BaseSearchProvider : public AutocompleteProvider,
   // |append_extra_query_params| should be set if |template_url| is the default
   // search engine, so the destination URL will contain any
   // command-line-specified query params.
+  // |from_app_list| should be set if the search was made from the app list.
   static AutocompleteMatch CreateSearchSuggestion(
       AutocompleteProvider* autocomplete_provider,
       const AutocompleteInput& input,
@@ -334,7 +338,8 @@ class BaseSearchProvider : public AutocompleteProvider,
       const TemplateURL* template_url,
       int accepted_suggestion,
       int omnibox_start_margin,
-      bool append_extra_query_params);
+      bool append_extra_query_params,
+      bool from_app_list);
 
   // Parses JSON response received from the provider, stripping XSSI
   // protection if needed. Returns the parsed data if successful, NULL
@@ -480,6 +485,9 @@ class BaseSearchProvider : public AutocompleteProvider,
   // causes us to auto-cancel all such requests on shutdown.
   SuggestionDeletionHandlers deletion_handlers_;
 
+  // True if this is in the app list. Otherwise, this is in the omnibox.

[Peter Kasting, 2014/04/09 02:12:33]

Nit: Maybe:

True if this provider's results are being displayed in the app list.  By default
this is false, meaning that the results will be shown in the omnibox.

[Sam McNally, 2014/04/09 05:33:44]

Done.

+  bool in_app_list_;
+
   DISALLOW_COPY_AND_ASSIGN(BaseSearchProvider);
 };