[Android] Adding Smart GO/NEXT feature in Chrome

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2553 matching lines @@
     clip_html =
         CreateMarkup(start_position, end_position, kAnnotateForInterchange,
                      ConvertBlocksToInlines::kNotConvert, kResolveNonLocalURLs);
   } else {
     clip_html =
         CreateMarkup(end_position, start_position, kAnnotateForInterchange,
                      ConvertBlocksToInlines::kNotConvert, kResolveNonLocalURLs);
   }
 }
 
+void WebLocalFrameImpl::AdvanceFocusInForm(WebFocusType focusType) {
+  if (!GetFrame()->GetDocument())

[dcheng, 2017/04/27 15:33:02]

This check is unnecessary and should be a DCHECK if anything.

[AKVT, 2017/05/03 14:35:12]

Done.

+    return;
+
+  Element* element = GetFrame()->GetDocument()->FocusedElement();
+  if (!element)
+    return;
+
+  Element* nextElement =
+      GetFrame()->GetInputMethodController().NextFocusableElementInForm(
+          element, focusType);
+  if (!nextElement)
+    return;
+
+  nextElement->scrollIntoViewIfNeeded(true /*centerIfNeeded*/);
+  nextElement->focus();
+}
+
 TextCheckerClient& WebLocalFrameImpl::GetTextCheckerClient() const {
   return *text_checker_client_;
 }
 
 void WebLocalFrameImpl::SetTextCheckClient(
     WebTextCheckClient* text_check_client) {
   text_check_client_ = text_check_client;
 }
 
 }  // namespace blink