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 <list>
 #include <map>
 #include <string>
@@ skipping 22 matching lines @@
 class InstantNTP;
 class InstantOverlay;
 class InstantTab;
 class TemplateURL;
 
 namespace chrome {
 class BrowserInstantController;
 }
 
 namespace content {
+class NavigationEntry;
 class WebContents;
 }
 
 // Macro used for logging debug events. |message| should be a std::string.
 #define LOG_INSTANT_DEBUG_EVENT(controller, message) \
     controller->LogDebugEvent(message)
 
 // InstantController drives Chrome Instant, i.e., the browser implementation of
 // the Embedded Search API (see http://dev.chromium.org/embeddedsearch).
 //
@@ skipping 204 matching lines @@
   // Like HideOverlay(), but doesn't call OnStaleOverlay(). Use HideOverlay()
   // unless you are going to call overlay_.reset() yourself subsequently.
   void HideInternal();
 
   // Counterpart to HideOverlay(). Asks the |browser_| to display the preview
   // with the given |height| in |units|.
   void ShowOverlay(InstantShownReason reason,
                    int height,
                    InstantSizeUnits units);
 
+  // Copies the loader's active 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();
+
+  // Updates the URL in the transient history entry for the overlay.
+  void UpdateTransientHistoryEntry(const GURL& url);
+
+  // Discards any transient history entry set by Instant.
+  // See SetTransientHistoryEntry().
+  void ResetTransientHistoryEntry();
+
   // Send the omnibox popup bounds to the page.
   void SendPopupBoundsToPage();
 
   // Determines the Instant URL based on a number of factors:
   // If |extended_enabled_|:
   //   - If |use_local_preview_only_| is true return kLocalOmniboxPopupURL, else
   //   - If the Instant URL is specified by command line, returns it, else
   //   - If the default Instant URL is present returns it.
   // If !|extended_enabled_|:
   //   - If the Instant URL is specified by command line, returns it, else
@@ skipping 107 matching lines @@
   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_;
 
   // List of events and their timestamps, useful in debugging Instant behaviour.
   mutable std::list<std::pair<int64, std::string> > debug_events_;
 
+  // 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_