Bunch of match preview tweaks:

chrome/browser/search_engines/template_url.h

 // Copyright (c) 2010 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_TEMPLATE_URL_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 259 matching lines @@
     int width;
     int height;
 
     // URL of the image.
     GURL url;
   };
 
   // Generates a favicon URL from the specified url.
   static GURL GenerateFaviconURL(const GURL& url);
 
-  // Returns true if |true| is non-null and has a search URL that supports
+  // Returns true if |turl| is non-null and has a search URL that supports
   // replacement.
   static bool SupportsReplacement(const TemplateURL* turl);
 
   // Like SupportsReplacement but usable on threads other than the UI thread.
   static bool SupportsReplacementUsingTermsData(
       const TemplateURL* turl,
       const SearchTermsData& search_terms_data);
 
   TemplateURL();
   ~TemplateURL();
 
   // A short description of the template. This is the name we show to the user
   // in various places that use keywords. For example, the location bar shows
   // this when the user selects the keyword.
   void set_short_name(const std::wstring& short_name) {
     short_name_ = short_name;
   }
   const std::wstring& short_name() const { return short_name_; }
 
+  // Returns true if this search engine supports showing instant results.
+  // TODO(sky): make this real.
+  bool supports_instant() const { return false; }
+
   // An accessor for the short_name, but adjusted so it can be appropriately
   // displayed even if it is LTR and the UI is RTL.
   std::wstring AdjustedShortNameForLocaleDirection() const;
 
   // A description of the template; this may be empty.
   void set_description(const std::wstring& description) {
     description_ = description;
   }
   const std::wstring& description() const { return description_; }
 
@@ skipping 189 matching lines @@
   bool created_by_policy_;
   int usage_count_;
   TemplateURLPrepopulateData::SearchEngineType search_engine_type_;
   int logo_id_;
   int prepopulate_id_;
 
   // TODO(sky): Add date last parsed OSD file.
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_H_