Persist the extension omnibox default suggestion to Prefs.

chrome/browser/extensions/api/omnibox/omnibox_api.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_EXTENSIONS_API_OMNIBOX_OMNIBOX_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_OMNIBOX_OMNIBOX_API_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
+#include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "webkit/glue/window_open_disposition.h"
 
 class TemplateURL;
 namespace base {
 class ListValue;
 }
 
@@ skipping 47 matching lines @@
   virtual ~OmniboxSetDefaultSuggestionFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 };
 
 struct ExtensionOmniboxSuggestion {
   ExtensionOmniboxSuggestion();
   ~ExtensionOmniboxSuggestion();
 
+  // Populate a suggestion value from a DictionaryValue. If |require_content|
+  // is false, then we won't fail if |content| is missing, to support
+  // default suggestions.
+  bool Populate(const base::DictionaryValue& value, bool require_content);
+
   // Converts a list of style ranges from the extension into the format expected
   // by the autocomplete system.
   bool ReadStylesFromValue(const base::ListValue& value);
 
+  // Converts this structure to a DictionaryValue suitable for saving to disk.
+  scoped_ptr<base::DictionaryValue> ToValue() const;
+
   // The text that gets put in the edit box.
   string16 content;
 
   // The text that is displayed in the drop down.
   string16 description;
 
   // Contains style ranges for the description.
   ACMatchClassifications description_styles;
 };
 
@@ skipping 20 matching lines @@
 // Launch an Extension App from |match| details provided by the Omnibox. If the
 // application wants to launch as a window or panel, |disposition| is ignored;
 // otherwise it's used to determine in which tab we'll launch the application.
 void LaunchAppFromOmnibox(const AutocompleteMatch& match,
                           Profile* profile,
                           WindowOpenDisposition disposition);
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_OMNIBOX_OMNIBOX_API_H_