Disable touch calibration on external touchscreen.

ui/aura/test/test_screen.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 "ui/aura/test/test_screen.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "ui/aura/aura_switches.h"
 #include "ui/aura/display_util.h"
@@ skipping 10 matching lines @@
       CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kAuraHostWindowSize);
   display_ = aura::CreateDisplayFromSpec(size_str);
 }
 
 TestScreen::~TestScreen() {
 }
 
 RootWindow* TestScreen::CreateRootWindowForPrimaryDisplay() {
   DCHECK(!root_window_);
-  root_window_ = new RootWindow(RootWindow::CreateParams(display_.bounds()));
+  root_window_ = new RootWindow(
+      RootWindow::CreateParams(display_.bounds(), true));
   root_window_->AddObserver(this);
   root_window_->Init();
   if (UseFullscreenHostWindow())
     root_window_->ConfineCursorToWindow();
   return root_window_;
 }
 
 bool TestScreen::IsDIPEnabled() {
   return true;
 }
@@ skipping 41 matching lines @@
   return display_;
 }
 
 void TestScreen::AddObserver(gfx::DisplayObserver* observer) {
 }
 
 void TestScreen::RemoveObserver(gfx::DisplayObserver* observer) {
 }
 
 }  // namespace aura