For webkit_glue::MockWebFrame, define setScrollOffset() that will be soon introduced.

webkit/mocks/mock_webframe.h

 // Copyright (c) 2011 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 WEBKIT_MOCKS_MOCK_WEBFRAME_H_
 #define WEBKIT_MOCKS_MOCK_WEBFRAME_H_
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
@@ skipping 53 matching lines @@
 
   virtual WebString name() const;
   virtual void setName(const WebString&);
   virtual long long identifier() const;
   virtual WebURL url() const;
   virtual WebURL favIconURL() const;
   virtual WebURL openSearchDescriptionURL() const;
   virtual WebString encoding() const;
   virtual void setCanHaveScrollbars(bool);
   virtual WebSize scrollOffset() const;
+  virtual void setScrollOffset(const WebSize&);
   virtual WebSize contentsSize() const;
   virtual int contentsPreferredWidth() const;
   virtual int documentElementScrollHeight() const;
   virtual bool hasVisibleContent() const;
   virtual WebView* view() const;
   virtual WebFrame* opener() const;
   virtual WebFrame* parent() const;
   virtual WebFrame* top() const;
   virtual WebFrame* firstChild() const;
   virtual WebFrame* lastChild() const;
@@ skipping 121 matching lines @@
                                  const WebString& elementId);
   virtual WebString layerTreeAsText() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockWebFrame);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_MOCKS_MOCK_WEBFRAME_H_