Persist the Instant API to committed search result pages.

chrome/browser/instant/instant_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_INSTANT_INSTANT_MODEL_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_MODEL_H_
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "chrome/common/instant_types.h"
 #include "chrome/common/search_types.h"
 
 class InstantController;
 class InstantModelObserver;
-class TabContents;
+
+namespace content {
+class WebContents;
+}
 
 // Holds state that is important to any views concerned with visibility and
 // layout of the Instant preview.
 class InstantModel {
  public:
   explicit InstantModel(InstantController* controller);
   ~InstantModel();
 
   // InstantModel only uses Mode::mode internally. Other parts of Mode, such as
   // Mode::origin, may have arbitrary values, and should be ignored.
   const chrome::search::Mode& mode() const { return mode_; }
   int height() const { return height_; }
   InstantSizeUnits height_units() const { return height_units_; }
 
   void SetPreviewState(const chrome::search::Mode& mode,
                        int height,
                        InstantSizeUnits height_units);
 
-  void SetPreviewContents(TabContents* preview_contents);
-  TabContents* GetPreviewContents() const;
+  void SetPreviewContents(content::WebContents* preview_contents);
+  content::WebContents* GetPreviewContents() const;
 
   // Add and remove observers.
   void AddObserver(InstantModelObserver* observer) const;
   void RemoveObserver(InstantModelObserver* observer) const;
 
  private:
   chrome::search::Mode mode_;
   int height_;
   InstantSizeUnits height_units_;
 
   // Weak. Remembers the last set preview contents to detect changes. Actual
   // preview contents is fetched from the |controller_| as this may not always
   // reflect the actual preview in effect.
-  TabContents* preview_contents_;
+  content::WebContents* preview_contents_;
 
   // Weak. The controller currently holds some model state.
   // TODO(dhollowa): Remove this, transfer all model state to InstantModel.
   InstantController* const controller_;
 
   // Observers.
   mutable ObserverList<InstantModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantModel);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_MODEL_H_