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

content/browser/renderer_host/render_view_host_delegate.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_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/i18n/rtl.h"
 #include "base/process_util.h"
 #include "base/string16.h"
 #include "content/common/content_export.h"
+#include "content/public/common/context_menu_source_type.h"
 #include "content/public/common/javascript_message_type.h"
 #include "content/public/common/media_stream_request.h"
 #include "net/base/load_states.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupType.h"
 #include "webkit/glue/window_open_disposition.h"
 
 class GURL;
 class SkBitmap;
 class WebContentsImpl;
 class WebKeyboardEvent;
@@ skipping 371 matching lines @@
   // Show the newly created widget with the specified bounds.
   // The widget is identified by the route_id passed to CreateNewWidget.
   virtual void ShowCreatedWidget(int route_id,
                                  const gfx::Rect& initial_pos) {}
 
   // Show the newly created full screen widget. Similar to above.
   virtual void ShowCreatedFullscreenWidget(int route_id) {}
 
   // 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) {}
 
   // The render view has requested access to media devices listed in
   // |request|, and the client should grant or deny that permission by
   // calling |callback|.
   virtual void RequestMediaAccessPermission(
       const MediaStreamRequest* request,
       const MediaResponseCallback& callback) {}
 
 #if defined(OS_ANDROID)
   virtual void AttachLayer(WebKit::WebLayer* layer) {}
   virtual void RemoveLayer(WebKit::WebLayer* layer) {}
 #endif
 
  protected:
   virtual ~RenderViewHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_