Upstream iOS web API.

ios/web/public/navigation_manager.h

Index: ios/web/public/navigation_manager.h
diff --git a/ios/web/public/navigation_manager.h b/ios/web/public/navigation_manager.h
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+// Copyright 2013 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_PUBLIC_NAVIGATION_MANAGER_H_
+#define IOS_WEB_PUBLIC_NAVIGATION_MANAGER_H_
+
+namespace web {
+
+class BrowserState;
+class NavigationItem;
+class WebState;
+
+// A NavigationManager maintains the back-forward list for a WebState and
+// manages all navigation within that list.
+//
+// Each NavigationManager belongs to one WebState; each WebState has
+// exactly one NavigationManager.
+class NavigationManager {
+ public:
+  virtual ~NavigationManager() {}
+
+  // Gets the BrowserState associated with this NavigationManager. Can never
+  // return null.
+  virtual BrowserState* GetBrowserState() const = 0;
+
+  // Gets the WebState associated with this NavigationManager.
+  virtual WebState* GetWebState() const = 0;
+
+  // Returns the NavigationItem that should be used when displaying info about
+  // the current entry to the user. It ignores certain pending entries, to
+  // prevent spoofing attacks using slow-loading navigations.
+  virtual NavigationItem* GetVisibleItem() const = 0;
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_PUBLIC_NAVIGATION_MANAGER_H_