Disable touch calibration on external touchscreen.

ui/aura/root_window_host_linux.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 UI_AURA_ROOT_WINDOW_HOST_LINUX_H_
 #define UI_AURA_ROOT_WINDOW_HOST_LINUX_H_
 
 #include <X11/Xlib.h>
 
 #include <vector>
@@ skipping 14 matching lines @@
 
 namespace aura {
 
 namespace internal {
 class TouchEventCalibrate;
 }
 
 class RootWindowHostLinux : public RootWindowHost,
                             public MessageLoop::Dispatcher {
  public:
-  explicit RootWindowHostLinux(const gfx::Rect& bounds);
+  explicit RootWindowHostLinux(const gfx::Rect& bounds,
+                               bool is_internal_display);
   virtual ~RootWindowHostLinux();
 
   // Overridden from Dispatcher overrides:
   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
 
   // RootWindowHost Overrides.
   virtual void SetDelegate(RootWindowHostDelegate* delegate) OVERRIDE;
   virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
@@ skipping 73 matching lines @@
   bool focus_when_shown_;
 
   scoped_ptr<XID[]> pointer_barriers_;
 
   scoped_ptr<internal::TouchEventCalibrate> touch_calibrate_;
 
   scoped_ptr<MouseMoveFilter> mouse_move_filter_;
 
   ui::X11AtomCache atom_cache_;
 
+  // True if RootWindow corresponds to an internal display (on ChromeOS).
+  bool is_internal_display_;
+
   DISALLOW_COPY_AND_ASSIGN(RootWindowHostLinux);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_LINUX_H_