Pass WebState to NativeAppNavigationController

ios/chrome/browser/native_app_launcher/native_app_navigation_util.mm

Index: ios/chrome/browser/native_app_launcher/native_app_navigation_util.mm
diff --git a/ios/chrome/browser/native_app_launcher/native_app_navigation_util.mm b/ios/chrome/browser/native_app_launcher/native_app_navigation_util.mm
new file mode 100644
index 0000000000000000000000000000000000000000..7a6c34e73252c18af0890885407f52eaa80708d0
--- /dev/null
+++ b/ios/chrome/browser/native_app_launcher/native_app_navigation_util.mm
@@ -0,0 +1,38 @@
+// 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/chrome/browser/native_app_launcher/native_app_navigation_util.h"
+
+#include "base/logging.h"
+#include "ios/web/public/navigation_item.h"
+#include "ios/web/public/navigation_manager.h"
+#import "ios/web/public/web_state/web_state.h"
+
+namespace native_app_launcher {
+
+bool IsLinkNavigation(web::WebState* web_state) {
+  web::NavigationManager* navigationManager = web_state->GetNavigationManager();
+  DCHECK(navigationManager);
+  int index = navigationManager->GetCurrentItemIndex();
+  // Walks backward on the navigation items list looking for the first item
+  // that is not the result of a redirect. Check if user arrived at that
+  // via link click or a suggestion on the UI.
+  while (index >= 0) {
+    web::NavigationItem* item = navigationManager->GetItemAtIndex(index);
+    DCHECK(item);
+    ui::PageTransition currentTransition = item->GetTransitionType();
+    // Checks non-redirect entries for transitions that are either links or
+    // bookmarks.
+    if ((currentTransition & ui::PAGE_TRANSITION_IS_REDIRECT_MASK) == 0) {
+      return PageTransitionCoreTypeIs(currentTransition,
+                                      ui::PAGE_TRANSITION_LINK) ||
+             PageTransitionCoreTypeIs(currentTransition,
+                                      ui::PAGE_TRANSITION_AUTO_BOOKMARK);
+    }
+    --index;
+  }
+  return false;
+}
+
+}  // namespace native_app_launcher