Move Get/SetScrollOffset methods from WebFrame to WebLocalFrame.

third_party/WebKit/public/web/WebLocalFrame.h

Index: third_party/WebKit/public/web/WebLocalFrame.h
diff --git a/third_party/WebKit/public/web/WebLocalFrame.h b/third_party/WebKit/public/web/WebLocalFrame.h
index cc4d81868b2930e33a3ea69ea2858cb9512624a3..0e48d6863fec65cc668c62f2614dc2e3c8fbb10a 100644
--- a/third_party/WebKit/public/web/WebLocalFrame.h
+++ b/third_party/WebKit/public/web/WebLocalFrame.h
@@ -701,6 +701,10 @@ class WebLocalFrame : public WebFrame {
 
   // Geometry -----------------------------------------------------------------
 
+  // The scroll offset from the top-left corner of the frame in pixels.
+  virtual WebSize GetScrollOffset() const = 0;
+  virtual void SetScrollOffset(const WebSize&) = 0;
+
   // If set to false, do not draw scrollbars on this frame's view.
   virtual void SetCanHaveScrollbars(bool) = 0;