Provide downcasts for WebLocalFrameBase using DEFINE_TYPE_CASTS macro.

third_party/WebKit/Source/core/frame/WebLocalFrameBase.h

 // 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.#ifndef WebViewBase_h
 
 #ifndef WebLocalFrameBase_h
 #define WebLocalFrameBase_h
 
 #include "core/CoreExport.h"
 #include "public/web/WebLocalFrame.h"
 
 namespace blink {
 
+class FrameView;
 class LocalFrame;
 class Node;
 class WebFrameClient;
 class WebTextCheckClient;
 class WebViewBase;
 
 // WebLocalFrameBase is a temporary class the provides a layer of abstraction
 // for WebLocalFrameImpl. Mehtods that are declared public in WebLocalFrameImpl
 // that are not overrides from WebLocalFrame will be declared pure virtual in
 // WebLocalFrameBase. Classes that then have a dependency on WebLocalFrameImpl
 // will then take a dependency on WebLocalFrameBase instead, so we can remove
 // cyclic dependencies in web/ and move classes from web/ into core/ or
 // modules.
 // TODO(slangley): Remove this class once WebLocalFrameImpl is in core/.
 class WebLocalFrameBase : public WebLocalFrame {
  public:
   CORE_EXPORT static WebLocalFrameBase* FromFrame(LocalFrame*);
   CORE_EXPORT static WebLocalFrameBase* FromFrame(LocalFrame&);
 
   virtual WebViewBase* ViewImpl() const = 0;
   virtual WebFrameClient* Client() const = 0;
   virtual WebTextCheckClient* TextCheckClient() const = 0;
   virtual void SetContextMenuNode(Node*) = 0;
   virtual void ClearContextMenuNode() = 0;
+  virtual LocalFrame* GetFrame() const = 0;
+  virtual FrameView* GetFrameView() const = 0;
 
  protected:
   explicit WebLocalFrameBase(WebTreeScopeType scope) : WebLocalFrame(scope) {}
 };
-}
+
+DEFINE_TYPE_CASTS(WebLocalFrameBase,
+                  WebFrame,
+                  frame,
+                  frame->IsWebLocalFrame(),
+                  frame.IsWebLocalFrame());
+
+}  // namespace blink
 
 #endif  // WebLocalFrameBase_h