Revert 244407 "InstantExtended: remove dead code related to the ..."

trunk/src/chrome/browser/ui/browser_instant_controller.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_BROWSER_INSTANT_CONTROLLER_H_
 #define CHROME_BROWSER_UI_BROWSER_INSTANT_CONTROLLER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/search/instant_service_observer.h"
 #include "chrome/browser/ui/search/instant_controller.h"
+#include "chrome/browser/ui/search/instant_unload_handler.h"
 #include "chrome/browser/ui/search/search_model_observer.h"
 
 class Browser;
 struct InstantSuggestion;
 class Profile;
 
 namespace content {
 class WebContents;
 }
 
 namespace gfx {
 class Rect;
 }
 
 class BrowserInstantController : public SearchModelObserver,
                                  public InstantServiceObserver {
  public:
   explicit BrowserInstantController(Browser* browser);
   virtual ~BrowserInstantController();
 
+  // If |url| is the new tab page URL, set |target_contents| to the preloaded
+  // NTP contents from InstantController. If |source_contents| is not NULL, we
+  // replace it with the new |target_contents| in the tabstrip and delete
+  // |source_contents|. Otherwise, the caller owns |target_contents| and is
+  // responsible for inserting it into the tabstrip.
+  //
+  // Returns true if and only if we update |target_contents|.
+  bool MaybeSwapInInstantNTPContents(
+      const GURL& url,
+      content::WebContents* source_contents,
+      content::WebContents** target_contents);
+
   // Commits the current Instant, returning true on success. This is intended
   // for use from OpenCurrentURL.
   bool OpenInstant(WindowOpenDisposition disposition, const GURL& url);
 
   // Returns the Profile associated with the Browser that owns this object.
   Profile* profile() const;
 
   // Returns the InstantController or NULL if there is no InstantController for
   // this BrowserInstantController.
   InstantController* instant() { return &instant_; }
@@ skipping 24 matching lines @@
   void ReloadTabsInInstantProcess();
 
   // Replaces the contents at tab |index| with |new_contents| and deletes the
   // existing contents.
   void ReplaceWebContentsAt(int index,
                             scoped_ptr<content::WebContents> new_contents);
 
   Browser* const browser_;
 
   InstantController instant_;
+  InstantUnloadHandler instant_unload_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserInstantController);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_INSTANT_CONTROLLER_H_