Add search_terms_replacement_key field to TemplateURL.

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 37 matching lines @@
   // accessing the Profile, so this can only ever be non-empty for
   // UIThreadSearchTermsData.
   virtual std::string InstantEnabledParam() const;
 
   // Returns a string indicating whether InstantExtended is enabled, suitable
   // for adding as a query string param to the homepage or search requests.
   // Returns an empty string otherwise.  Determining this requires accessing the
   // Profile, so this can only ever be non-empty for UIThreadSearchTermsData.
   virtual std::string InstantExtendedEnabledParam() const;
 
+  // Returns the parameter key used in InstantExtended URLs. To get the
+  // "key=value" pair use InstantExtendedEnabledParam().
+  virtual std::string InstantExtendedEnabledKey() const;

[Peter Kasting, 2012/12/18 01:54:43]

How come this needs to be virtual (or in fact defined in SearchTermsData at
all)?  Seems like we could just access the public string in google_util directly
at the callsite.

[beaudoin, 2012/12/20 04:23:29]

Done.

+
  private:
   DISALLOW_COPY_AND_ASSIGN(SearchTermsData);
 };
 
 // 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 InstantEnabledParam() and InstantExtendedEnabledParam() will
   // return the empty string.
@@ skipping 11 matching lines @@
   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_