Context menus should appear above the touch point if invoked by long press.

content/port/browser/render_view_host_delegate_view.h

 // Copyright (c) 2012 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 CONTENT_PORT_BROWSER_RENDER_VIEW_HOST_DELEGATE_VIEW_H_
 #define CONTENT_PORT_BROWSER_RENDER_VIEW_HOST_DELEGATE_VIEW_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
+#include "content/public/common/context_menu_source_type.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 
 class SkBitmap;
 struct WebDropData;
 struct WebMenuItem;
 
 namespace gfx {
 class ImageSkia;
 class Point;
 class Rect;
 }
 
 namespace content {
 
 struct ContextMenuParams;
 
 // This class provides a way for the RenderViewHost to reach out to its
 // delegate's view. It only needs to be implemented by embedders if they don't
 // use the default WebContentsView implementations.
 class CONTENT_EXPORT RenderViewHostDelegateView {
  public:
   // A context menu should be shown, to be built using the context information
   // provided in the supplied params.
-  virtual void ShowContextMenu(const ContextMenuParams& params) {}
+  virtual void ShowContextMenu(const ContextMenuParams& params,
+                               const ContextMenuSourceType& type) {}

[jam, 2012/09/07 17:07:56]

ditto

 
   // Shows a popup menu with the specified items.
   // This method should call RenderViewHost::DidSelectPopupMenuItem[s]() or
   // RenderViewHost::DidCancelPopupMenu() based on the user action.
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,
                              int selected_item,
                              const std::vector<WebMenuItem>& items,
                              bool right_aligned,
@@ skipping 19 matching lines @@
   // retrieved by doing a Shift-Tab.
   virtual void TakeFocus(bool reverse) {}
 
  protected:
   virtual ~RenderViewHostDelegateView() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PORT_BROWSER_RENDER_VIEW_HOST_DELEGATE_VIEW_H_