Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/instant_overlay_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_OVERLAY_MODEL_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_OVERLAY_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 InstantOverlayModelObserver;
+class InstantService;
 
 namespace content {
 class WebContents;
 }
 
 // Holds state that is important to any views concerned with visibility and
 // layout of the Instant overlay.
 class InstantOverlayModel {
  public:
-  explicit InstantOverlayModel(InstantController* controller);
+  explicit InstantOverlayModel(InstantService* service);
   ~InstantOverlayModel();
 
-  // InstantOverlayModel 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_; }
+  content::WebContents* contents() const { return contents_; }
   int height() const { return height_; }
   InstantSizeUnits height_units() const { return height_units_; }
 
-  void SetOverlayState(const chrome::search::Mode& mode,
+  void SetOverlayState(content::WebContents* contents,
                        int height,
                        InstantSizeUnits height_units);
 
-  void SetOverlayContents(content::WebContents* overlay_contents);
-  content::WebContents* GetOverlayContents() const;
-
   // Add and remove observers.
   void AddObserver(InstantOverlayModelObserver* observer);
   void RemoveObserver(InstantOverlayModelObserver* observer);
 
  private:
-  chrome::search::Mode mode_;
+  content::WebContents* contents_;
   int height_;
   InstantSizeUnits height_units_;
 
-  // Weak. Remembers the last set overlay contents to detect changes. Actual
-  // overlay contents is fetched from the |controller_| as this may not always
-  // reflect the actual overlay in effect.
-  content::WebContents* overlay_contents_;
-
-  // Weak. The controller currently holds some model state.
-  // TODO(dhollowa): Remove this, transfer all state to InstantOverlayModel.
-  InstantController* const controller_;
-
   // Observers.
   ObserverList<InstantOverlayModelObserver> observers_;
 
+  InstantService* const service_;
+
   DISALLOW_COPY_AND_ASSIGN(InstantOverlayModel);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_OVERLAY_MODEL_H_