Implemented WebStateObserver::DidFinishNavigation(NavigationHandle*).

ios/web/web_state/navigation_handle_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_handle_impl.h"
+
+#include "base/memory/ptr_util.h"
+
+namespace web {
+
+// static
+std::unique_ptr<NavigationHandle> NavigationHandleImpl::CreateNavigationHandle(
+    WebState* web_state,
+    const GURL& url) {
+  return base::MakeUnique<NavigationHandleImpl>(
+      web_state, url, false /* is_same_page */, false /* is_error_page */);
+}
+
+// static
+std::unique_ptr<NavigationHandle>
+NavigationHandleImpl::CreateSamePageNavigationHandle(WebState* web_state,
+                                                     const GURL& url) {
+  return base::MakeUnique<NavigationHandleImpl>(
+      web_state, url, true /* is_same_page */, false /* is_error_page */);
+}
+
+// static
+std::unique_ptr<NavigationHandle>
+NavigationHandleImpl::CreateErrorPageNavigationHandle(WebState* web_state,
+                                                      const GURL& url) {
+  return base::MakeUnique<NavigationHandleImpl>(
+      web_state, url, false /* is_same_page */, true /* is_error_page */);
+}
+
+NavigationHandleImpl::NavigationHandleImpl(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) {}
+
+NavigationHandleImpl::~NavigationHandleImpl() = default;
+
+WebState* NavigationHandleImpl::GetWebState() {
+  return web_state_;
+}
+
+const GURL& NavigationHandleImpl::GetUrl() const {
+  return url_;
+}
+
+bool NavigationHandleImpl::IsSamePage() const {
+  return is_same_page_;
+}
+
+bool NavigationHandleImpl::IsErrorPage() const {
+  return is_error_page_;
+}
+
+}  // namespace web