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

content/browser/web_contents/web_contents_view_gtk.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_view_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
@@ skipping 310 matching lines @@
   if (gtk_widget_is_focus(widget))
     return FALSE;
 
   gtk_widget_grab_focus(widget);
   bool reverse = focus == GTK_DIR_TAB_BACKWARD;
   web_contents_->FocusThroughTabTraversal(reverse);
   return TRUE;
 }
 
 void WebContentsViewGtk::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   if (delegate_.get())
-    delegate_->ShowContextMenu(params);
+    delegate_->ShowContextMenu(params, type);
   else
     DLOG(ERROR) << "Cannot show context menus without a delegate.";
 }
 
 void WebContentsViewGtk::ShowPopupMenu(const gfx::Rect& bounds,
                                        int item_height,
                                        double item_font_size,
                                        int selected_item,
                                        const std::vector<WebMenuItem>& items,
                                        bool right_aligned,
@@ skipping 43 matching lines @@
   // We manually tell our RWHV to resize the renderer content.  This avoids
   // spurious resizes from GTK+.
   RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
   if (rwhv)
     rwhv->SetSize(size);
   if (web_contents_->GetInterstitialPage())
     web_contents_->GetInterstitialPage()->SetSize(size);
 }
 
 }  // namespace content