Adds link disambiguation popup support to Windows.

content/browser/renderer_host/render_view_host_delegate_view.h

Index: content/browser/renderer_host/render_view_host_delegate_view.h
diff --git a/content/browser/renderer_host/render_view_host_delegate_view.h b/content/browser/renderer_host/render_view_host_delegate_view.h
index fb2babdc87f5e54cf186b5b3f330f4570ac93355..aec4b3b33de658e3c450eea0517bf7deb2f590fb 100644
--- a/content/browser/renderer_host/render_view_host_delegate_view.h
+++ b/content/browser/renderer_host/render_view_host_delegate_view.h
@@ -73,6 +73,14 @@ class CONTENT_EXPORT RenderViewHostDelegateView {
   // retrieved by doing a Shift-Tab.
   virtual void TakeFocus(bool reverse) {}
 
+#if defined(OS_WIN)
+  // Shows a Link Disambiguation popup. |target_rect| is the area the user
+  // touched that resulted in ambiguity, in DIPs in the host's coordinate
+  // system, and |zoomed_bitmap| is an enlarged image of that |target_rect|.
+  virtual void ShowDisambiguationPopup(const gfx::Rect& target_rect,
+                                       const SkBitmap& zoomed_bitmap) {}
+#endif
+
  protected:
   virtual ~RenderViewHostDelegateView() {}
 };