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

chrome/browser/ui/views/tab_contents/render_view_context_menu_views.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 "chrome/browser/ui/views/tab_contents/render_view_context_menu_views.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "content/public/browser/render_widget_host_view.h"
@@ skipping 24 matching lines @@
 
 #if !defined(OS_WIN)
 // static
 RenderViewContextMenuViews* RenderViewContextMenuViews::Create(
     content::WebContents* tab_contents,
     const content::ContextMenuParams& params) {
   return new RenderViewContextMenuViews(tab_contents, params);
 }
 #endif  // OS_WIN
 
-void RenderViewContextMenuViews::RunMenuAt(views::Widget* parent,
-                                           const gfx::Point& point) {
+void RenderViewContextMenuViews::RunMenuAt(
+    views::Widget* parent,
+    const gfx::Point& point,
+    const content::ContextMenuEventType& type) {
+  views::MenuItemView::AnchorPosition anchor_position =
+      type == content::GESTURE_CONTEXT_MENU ?
+          views::MenuItemView::BOTTOMCENTER : views::MenuItemView::TOPLEFT;
   if (menu_runner_->RunMenuAt(parent, NULL, gfx::Rect(point, gfx::Size()),
-          views::MenuItemView::TOPLEFT, views::MenuRunner::HAS_MNEMONICS |
+      anchor_position, views::MenuRunner::HAS_MNEMONICS |
           views::MenuRunner::CONTEXT_MENU) ==
       views::MenuRunner::MENU_DELETED)
     return;
 }
 
 void RenderViewContextMenuViews::UpdateMenuItemStates() {
   menu_delegate_->BuildMenu(menu_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 64 matching lines @@
   item->SetEnabled(enabled);
   item->SetTitle(title);
   item->SetVisible(!hidden);
 
   views::MenuItemView* parent = item->GetParentMenuItem();
   if (!parent)
     return;
 
   parent->ChildrenChanged();
 }