<webview>: Move back, forward, canGoBack, canGoForward, go from content to chrome

content/renderer/browser_plugin/browser_plugin.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  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_H_
 #define  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_H_
 
 #include "third_party/WebKit/public/web/WebPlugin.h"
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 90 matching lines @@
   // Returns whether this BrowserPlugin has requested an instance ID.
   bool HasNavigated() const;
   // Returns whether this BrowserPlugin has allocated an instance ID.
   bool HasGuestInstanceID() const;
 
   // Attaches the window identified by |window_id| to the the given node
   // encapsulating a BrowserPlugin.
   static bool AttachWindowTo(const WebKit::WebNode& node,
                              int window_id);
 
-  // Query whether the guest can navigate back to the previous entry.
-  bool CanGoBack() const;
-  // Query whether the guest can navigation forward to the next entry.
-  bool CanGoForward() const;
-
   // Informs the guest of an updated focus state.
   void UpdateGuestFocusState();
   // Indicates whether the guest should be focused.
   bool ShouldGuestBeFocused() const;
 
   // Embedder's device scale factor changed, we need to update the guest
   // renderer.
   void UpdateDeviceScaleFactor(float device_scale_factor);
 
-  // Tells the BrowserPlugin to tell the guest to navigate to the previous
-  // navigation entry in the navigation history.
-  void Back();
-  // Tells the BrowserPlugin to tell the guest to navigate to the next
-  // navigation entry in the navigation history.
-  void Forward();
-  // Tells the BrowserPlugin to tell the guest to navigate to a position
-  // relative to the current index in its navigation history.
-  void Go(int relativeIndex);
   // Tells the BrowserPlugin to terminate the guest process.
   void TerminateGuest();
 
   // A request from JavaScript has been made to stop the loading of the page.
   void Stop();
   // A request from JavaScript has been made to reload the page.
   void Reload();
   // A request to enable hardware compositing.
   void EnableCompositing(bool enable);
   // A request from content client to track lifetime of a JavaScript object
@@ skipping 284 matching lines @@
   typedef std::pair<int, base::WeakPtr<BrowserPlugin> >
       AliveV8PermissionRequestItem;
   std::map<int, AliveV8PermissionRequestItem*>
       alive_v8_permission_request_objects_;
 
   // BrowserPlugin outlives RenderViewImpl in Chrome Apps and so we need to
   // store the BrowserPlugin's BrowserPluginManager in a member variable to
   // avoid accessing the RenderViewImpl.
   scoped_refptr<BrowserPluginManager> browser_plugin_manager_;
 
-  // Important: Do not add more history state here.
-  // We strongly discourage storing additional history state (such as page IDs)
-  // in the embedder process, at the risk of having incorrect information that
-  // can lead to broken back/forward logic in apps.
-  // It's also important that this state does not get modified by any logic in
-  // the embedder process. It should only be updated in response to navigation
-  // events in the guest.  No assumptions should be made about how the index
-  // will change after a navigation (e.g., for back, forward, or go), because
-  // the changes are not always obvious.  For example, there is a maximum
-  // number of entries and earlier ones will automatically be pruned.
-  int current_nav_entry_index_;
-  int nav_entry_count_;
-
   // Used for HW compositing.
   bool compositing_enabled_;
   scoped_refptr<BrowserPluginCompositingHelper> compositing_helper_;
 
   // Used to identify the plugin to WebBindings.
   scoped_ptr<struct _NPP> npp_;
 
   // Weak factory used in v8 |MakeWeak| callback, since the v8 callback might
   // get called after BrowserPlugin has been destroyed.
   base::WeakPtrFactory<BrowserPlugin> weak_ptr_factory_;
 
   std::vector<EditCommand> edit_commands_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPlugin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_H_