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

chrome/browser/search_engines/search_terms_data.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SEARCH_ENGINES_SEARCH_TERMS_DATA_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_SEARCH_TERMS_DATA_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 16 matching lines @@
   // Returns the value for the GOOGLE_BASE_SUGGEST_URL term.  This
   // implementation simply returns the default value.
   std::string GoogleBaseSuggestURLValue() const;
 
   // Returns the locale used by the application.  This implementation returns
   // "en" and thus should be overridden where the result is actually meaningful.
   virtual std::string GetApplicationLocale() const;
 
   // Returns the value for the Chrome Omnibox rlz.  This implementation returns
   // the empty string.
-  virtual base::string16 GetRlzParameterValue() const;
+  virtual base::string16 GetRlzParameterValue(bool from_app_list) const;
 
   // The optional client parameter passed with Google search requests.  This
   // implementation returns the empty string.
   virtual std::string GetSearchClient() const;
 
   // The suggest client parameter ("client") passed with Google suggest
   // requests.  See GetSuggestRequestIdentifier() for more details.
   // This implementation returns the empty string.
   virtual std::string GetSuggestClient() const;
 
@@ skipping 16 matching lines @@
 
 // Implementation of SearchTermsData that is only usable on the UI thread.
 class UIThreadSearchTermsData : public SearchTermsData {
  public:
   // If |profile_| is NULL, the Google base URL accessors will return default
   // values, and NTPIsThemedParam() will return an empty string.
   explicit UIThreadSearchTermsData(Profile* profile);
 
   virtual std::string GoogleBaseURLValue() const OVERRIDE;
   virtual std::string GetApplicationLocale() const OVERRIDE;
-  virtual base::string16 GetRlzParameterValue() const OVERRIDE;
+  virtual base::string16 GetRlzParameterValue(bool from_app_list) const
+      OVERRIDE;
   virtual std::string GetSearchClient() const OVERRIDE;
   virtual std::string GetSuggestClient() const OVERRIDE;
   virtual std::string GetSuggestRequestIdentifier() const OVERRIDE;
   virtual std::string NTPIsThemedParam() const OVERRIDE;
 
   // Used by tests to override the value for the Google base URL.  Passing the
   // empty string cancels this override.
   static void SetGoogleBaseURL(const std::string& base_url);
 
  private:
   static std::string* google_base_url_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(UIThreadSearchTermsData);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_SEARCH_TERMS_DATA_H_