Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 266 matching lines @@
   // Pass the WebViewImpl's self-reference to the caller.
   return WebViewImpl::Create(client, visibility_state);
 }
 
 WebViewImpl* WebViewImpl::Create(WebViewClient* client,
                                  WebPageVisibilityState visibility_state) {
   // Pass the WebViewImpl's self-reference to the caller.
   return AdoptRef(new WebViewImpl(client, visibility_state)).LeakRef();
 }
 
+const WebInputEvent* WebViewBase::CurrentInputEvent() {
+  return WebViewImpl::CurrentInputEvent();
+}
+
 void WebView::SetUseExternalPopupMenus(bool use_external_popup_menus) {
   g_should_use_external_popup_menus = use_external_popup_menus;
 }
 
 void WebView::UpdateVisitedLinkState(unsigned long long link_hash) {
   Page::VisitedStateChanged(link_hash);
 }
 
 void WebView::ResetVisitedLinkState(bool invalidate_visited_link_hashes) {
   Page::AllVisitedStateChanged(invalidate_visited_link_hashes);
@@ skipping 3860 matching lines @@
   if (focused_frame->LocalFrameRoot() != MainFrameImpl()->GetFrame())
     return nullptr;
   return focused_frame;
 }
 
 LocalFrame* WebViewImpl::FocusedLocalFrameAvailableForIme() const {
   return ime_accept_events_ ? FocusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink