Send Navigation notifications to clients.

services/navigation/public/interfaces/view.mojom

 // Copyright 2016 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.
 
 module navigation.mojom;
 
 import "components/mus/public/interfaces/window_tree.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "url/mojo/url.mojom";
 
+// Copied from //content/public/browser/navigation_entry.h
+struct NavigationEntry {
+  int32 id;
+  url.mojom.Url url;
+  string title;
+  array<url.mojom.Url> redirect_chain;
+};
+
+// Copied from //content/public/browser/navigation_type.h
+enum NavigationType {
+  UNKNOWN,
+  NEW_PAGE,
+  EXISTING_PAGE,
+  SAME_PAGE,
+  NEW_SUBFRAME,
+  AUTO_SUBFRAME,
+  NAV_IGNORE
+};
+
+// Copied from //content/public/browser/navigation_details.h
+struct NavigationCommittedDetails {
+  int32 entry;
+  NavigationType type;
+  int32 previous_entry_index;
+  url.mojom.Url previous_url;
+  bool did_replace_entry;
+  bool is_in_page;
+  bool is_main_frame;
+  // SSLStatus ssl_status;
+  int32 http_status_code;
+};
+
 interface ViewFactory {
   CreateView(ViewClient client, View& view);
 };
 
 interface ViewClient {
   LoadingStateChanged(bool is_loading);
   NavigationStateChanged(url.mojom.Url url,
                          string title,
                          bool can_go_back,
                          bool can_go_forward);
   LoadProgressChanged(double progress);
   UpdateHoverURL(url.mojom.Url url);
 
   ViewCreated(View view,
               ViewClient& client,
               bool is_popup,
               gfx.mojom.Rect initial_rect,
               bool user_gesture);
   Close();
+
+  // See //content/public/browser/notification_types.h for descriptions of
+  // these events.
+  NavigationPending(NavigationEntry entry);
+  NavigationCommitted(NavigationCommittedDetails details,
+                      int32 current_index);
+  NavigationListPruned(bool from_front, int32 count);
+  NavigationEntryChanged(NavigationEntry entry, int32 entry_index);
 };
 
 interface View {
   // Navigates the view to |url|.
   NavigateTo(url.mojom.Url url);
 
   GoBack();
   GoForward();
+  NavigateToOffset(int32 offset);
   Reload(bool skip_cache);
   Stop();
 
   // Obtains a Mus WindowTreeClient for the View, so it can be embedded in a
   // UI.
   GetWindowTreeClient(mus.mojom.WindowTreeClient& client);
 
   ShowInterstitial(string html);
   HideInterstitial();
 
   // The resize area is a rectangle in the bottom corner of the view that allows
   // the top-level window containing the view to be interactively resized.
   SetResizerSize(gfx.mojom.Size size);
 };