[Search] Store and recall search terms using NavigationEntry to improve search term extraction

chrome/browser/ui/toolbar/toolbar_model.h

 // Copyright 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_UI_TOOLBAR_TOOLBAR_MODEL_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MODEL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 33 matching lines @@
   //   will be displayed in place of the URL.
   virtual string16 GetText(bool display_search_urls_as_search_terms) const = 0;
 
   // Returns the URL of the current navigation entry.
   virtual GURL GetURL() const = 0;
 
   // Returns true if a call to GetText(true) would successfully replace the URL
   // with search terms.
   virtual bool WouldReplaceSearchURLWithSearchTerms() const = 0;
 
+  // Returns search terms if they were set on the NavigationEntry, or empty
+  // string otherwise.
+  virtual string16 GetSearchTermsFromNavigationEntry() const = 0;
+
   // Returns the security level that the toolbar should display.
   virtual SecurityLevel GetSecurityLevel() const = 0;
 
   // Returns the resource_id of the icon to show to the left of the address,
   // based on the current URL.  This doesn't cover specialized icons while the
   // user is editing; see OmniboxView::GetIcon().
   virtual int GetIcon() const = 0;
 
   // Returns the name of the EV cert holder.  Only call this when the security
   // level is EV_SECURE.
   virtual string16 GetEVCertName() const = 0;
 
   // Returns whether the URL for the current navigation entry should be
   // in the location bar.
   virtual bool ShouldDisplayURL() const = 0;
 
   // Getter/setter of whether the text in location bar is currently being
   // edited.
   virtual void SetInputInProgress(bool value) = 0;
   virtual bool GetInputInProgress() const = 0;
 
  protected:
    ToolbarModel() {}
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MODEL_H_