InstantExtended: Transient naventry for preview.

chrome/browser/instant/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_INSTANT_INSTANT_CONTROLLER_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 18 matching lines @@
 class AutocompleteProvider;
 class InstantLoader;
 class InstantTab;
 class TemplateURL;
 
 namespace chrome {
 class BrowserInstantController;
 }
 
 namespace content {
+class NavigationEntry;
 class WebContents;
 }
 
 // InstantController maintains a WebContents that is intended to give a preview
 // of search suggestions and results. InstantController is owned by Browser via
 // BrowserInstantController.
 class InstantController {
  public:
   // The URL for the local omnibox popup.
   static const char* kLocalOmniboxPopupURL;
@@ skipping 166 matching lines @@
   // Like HideLoader(), but doesn't call OnStaleLoader(). Use HideLoader()
   // unless you are going to call loader_.reset() yourself subsequently.
   void HideInternal();
 
   // Counterpart to HideLoader(). Asks the |browser_| to display the preview
   // with the given |height|.
   void ShowLoader(InstantShownReason reason,
                   int height,
                   InstantSizeUnits units);
 
+  // Copies the loader's NavigationEntry into a transient history entry for the
+  // active tab. Used to update the tab title and make the back button work as
+  // expected when the preview is shown at full height but not yet committed.
+  void SetTransientHistoryEntry();
+
+  // Restores the old transient entry for the active tab, if any.
+  void ResetTransientHistoryEntry();
+
   // Send the omnibox popup bounds to the page.
   void SendPopupBoundsToPage();
 
   // If |template_url| is a valid TemplateURL for use with Instant, fills in
   // |instant_url| and returns true; returns false otherwise.
   // Note: If the command-line switch kInstantURL is set, this method uses its
   // value for |instant_url| and returns true without examining |template_url|.
   bool GetInstantURL(const TemplateURL* template_url,
                      std::string* instant_url) const;
 
@@ skipping 82 matching lines @@
 
   // The timestamp at which query editing began. This value is used when the
   // preview is showed and cleared when the preview is hidden.
   base::Time first_interaction_time_;
 
   // Whether to allow the preview to show search suggestions. In general, the
   // preview is allowed to show search suggestions whenever |search_mode_| is
   // MODE_SEARCH_SUGGESTIONS, except in those cases where this is false.
   bool allow_preview_to_show_search_suggestions_;
 
+  // The transient navigation entry associated with the active tab, if any.
+  scoped_ptr<content::NavigationEntry> transient_entry_;
+
+  // True iff Instant has set a transient history entry for the active tab.
+  bool instant_set_transient_entry_;
+
   DISALLOW_COPY_AND_ASSIGN(InstantController);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_