Implemented WebStateObserver::DidFinishNavigation(NavigationHandle*).

ios/web/web_state/navigation_context_impl.mm

+// Copyright 2017 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.
+
+#include "ios/web/web_state/navigation_context_impl.h"
+
+#include "base/memory/ptr_util.h"
+
+namespace web {
+
+// static
+std::unique_ptr<NavigationContext>
+NavigationContextImpl::CreateNavigationContext(WebState* web_state,
+                                               const GURL& url) {
+  std::unique_ptr<NavigationContext> resut(new NavigationContextImpl(
+      web_state, url, false /* is_same_page */, false /* is_error_page */));
+  return resut;
+}
+
+// static
+std::unique_ptr<NavigationContext>
+NavigationContextImpl::CreateSamePageNavigationContext(WebState* web_state,
+                                                       const GURL& url) {
+  std::unique_ptr<NavigationContext> result(new NavigationContextImpl(
+      web_state, url, true /* is_same_page */, false /* is_error_page */));
+  return result;
+}
+
+// static
+std::unique_ptr<NavigationContext>
+NavigationContextImpl::CreateErrorPageNavigationContext(WebState* web_state,
+                                                        const GURL& url) {
+  std::unique_ptr<NavigationContext> result(new NavigationContextImpl(
+      web_state, url, false /* is_same_page */, true /* is_error_page */));
+  return result;
+}
+
+WebState* NavigationContextImpl::GetWebState() {
+  return web_state_;
+}
+
+const GURL& NavigationContextImpl::GetUrl() const {
+  return url_;
+}
+
+bool NavigationContextImpl::IsSamePage() const {
+  return is_same_page_;
+}
+
+bool NavigationContextImpl::IsErrorPage() const {
+  return is_error_page_;
+}
+
+NavigationContextImpl::NavigationContextImpl(WebState* web_state,
+                                             const GURL& url,
+                                             bool is_same_page,
+                                             bool is_error_page)
+    : web_state_(web_state),
+      url_(url),
+      is_same_page_(is_same_page),
+      is_error_page_(is_error_page) {}
+
+NavigationContextImpl::~NavigationContextImpl() = default;
+
+}  // namespace web