A working implementation of AQS (Assisted Query Stats).

chrome/browser/autocomplete/autocomplete_match.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_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_
 #pragma once
 
 #include <vector>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/common/page_transition_types.h"
 #include "googleurl/src/gurl.h"
 
 class AutocompleteProvider;
 class Profile;
+class SearchTermsArgs;
 class TemplateURL;
 
 // AutocompleteMatch ----------------------------------------------------------
 
 // A single result line with classified spans.  The autocomplete popup displays
 // the 'contents' and the 'description' (the description is optional) in the
 // autocomplete dropdown, and fills in 'fill_into_edit' into the textbox when
 // that line is selected.  fill_into_edit may be the same as 'description' for
 // things like URLs, but may be different for searches or other providers.  For
 // example, a search result may say "Search for asdf" as the description, but
@@ skipping 239 matching lines @@
   // accesses it must perform any necessary sanity checks before blindly using
   // it!
   string16 keyword;
 
   // True if the user has starred the destination URL.
   bool starred;
 
   // True if this match is from a previous result.
   bool from_previous;
 
+  // Optional search terms arguments used to initialize destination_url above.

[Peter Kasting, 2012/06/16 03:14:17]

Nit: How about:

"Optional search terms args.  If present,
AutocompleteController::UpdateAssistedQueryStats() will incorporate this data
with additional data it calculates and pass the completed struct to
TemplateURLRef::ReplaceSearchTerms() to reset the match's |destination_url|
after the complete set of matches in the AutocompleteResult has been chosen and
sorted.  Most providers will leave this as NULL, which will cause the
AutocompleteController to do no additional transformations."

I think this avoids the need for the second paragraph as well, but let me know
if you think it's unclear.

[Bart N, 2012/06/16 23:38:10]

Done.

+  // If present, it will be passed to TemplateURL::ReplaceSearchTerms, otherwise
+  // the destination URL won't be set.
+  //
+  // Note: The contents of this structure gets initialized at different
+  // processing stages.  For instance, the original query (input) and search
+  // terms are set by the SearchProvider, but the remaining fields,
+  // e.g. assisted_query_stats, are set later on by the AutocompleteController.
+  scoped_ptr<SearchTermsArgs> search_terms_args;
+
 #ifndef NDEBUG
   // Does a data integrity check on this match.
   void Validate() const;
 
   // Checks one text/classifications pair for valid values.
   void ValidateClassifications(
       const string16& text,
       const ACMatchClassifications& classifications) const;
 #endif
 };
 
 typedef AutocompleteMatch::ACMatchClassification ACMatchClassification;
 typedef std::vector<ACMatchClassification> ACMatchClassifications;
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_