Upstream ios/web/navigation

ios/web/navigation/navigation_manager_facade_delegate.h

Index: ios/web/navigation/navigation_manager_facade_delegate.h
diff --git a/ios/web/navigation/navigation_manager_facade_delegate.h b/ios/web/navigation/navigation_manager_facade_delegate.h
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+// Copyright 2014 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 IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_FACADE_DELEGATE_H_
+#define IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_FACADE_DELEGATE_H_
+
+namespace content {
+class NavigationController;
+}
+
+namespace web {
+
+class NavigationItemImpl;
+class NavigationManagerImpl;
+
+// Interface used by the NavigationManager to drive the NavigationController
+// facade. This pushes the ownership of the facade out of the web-layer to
+// simplify upstreaming efforts.  Once upstream features are componentized and
+// use NavigationManager, this class will no longer be necessary.
+class NavigationManagerFacadeDelegate {
+ public:
+  NavigationManagerFacadeDelegate() {}
+  virtual ~NavigationManagerFacadeDelegate() {}
+
+  // Sets the NavigationManagerImpl that backs the NavigationController facade.
+  virtual void SetNavigationManager(
+      NavigationManagerImpl* navigation_manager) = 0;
+  // Returns the facade object being driven by this delegate.
+  virtual content::NavigationController* GetNavigationControllerFacade() = 0;
+
+  // Callbacks for triggering notifications:
+
+  // Called when the NavigationManager has a pending NavigationItem.
+  virtual void OnNavigationItemPending() = 0;
+  // Called when the NavigationManager has updated a NavigationItem.
+  virtual void OnNavigationItemChanged() = 0;
+  // Called when the NavigationManager has committed a pending NavigationItem.
+  virtual void OnNavigationItemCommitted(int previous_item_index,
+                                         bool is_in_page) = 0;
+  // Called when the NavigationManager has pruned committed NavigationItems.
+  virtual void OnNavigationItemsPruned(size_t pruned_item_count) = 0;
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_FACADE_DELEGATE_H_