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 0ff4a000c6e71c3dba73e780db785e372a3533de..c1b956a0bcb5a15d7210d500e3115294cdd2ccf4 100644
--- a/content/browser/renderer_host/render_view_host_delegate_view.h
+++ b/content/browser/renderer_host/render_view_host_delegate_view.h
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "content/common/content_export.h"
 #include "content/common/drag_event_source_info.h"
 #include "third_party/WebKit/public/web/WebDragOperation.h"
@@ -20,6 +21,11 @@ class Rect;
 class Vector2d;
 }
 
+namespace ui {
+class GestureEvent;
+class MouseEvent;
+}
+
 namespace content {
 class RenderFrameHost;
 struct ContextMenuParams;
@@ -76,6 +82,22 @@ class CONTENT_EXPORT RenderViewHostDelegateView {
   virtual void HidePopupMenu() {};
 #endif
 
+#if defined(TOOLKIT_VIEWS)
+  // 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, |zoomed_bitmap| is an enlarged image of that |target_rect|, and
+  // |callback| is for forwarding on to the original scale web content.
+  virtual void ShowDisambiguationPopup(
+      const gfx::Rect& target_rect,
+      const SkBitmap& zoomed_bitmap,
+      const base::Callback<void(ui::GestureEvent*)>& gesture_cb,
+      const base::Callback<void(ui::MouseEvent*)>& mouse_cb) {}
+
+  // Hides the Link Disambiguation Popup, if it was showing, otherwise does
+  // nothing.
+  virtual void HideDisambiguationPopup() {}
+#endif
+
  protected:
   virtual ~RenderViewHostDelegateView() {}
 };