Disable touch calibration on external touchscreen.

ui/gfx/display.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_GFX_DISPLAY_H_
 #define UI_GFX_DISPLAY_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/base/ui_export.h"
@@ skipping 71 matching lines @@
   void SetSize(const gfx::Size& size_in_pixel);
 
   // Computes and updates the display's work are using
   // |work_area_insets| and the bounds.
   void UpdateWorkAreaFromInsets(const gfx::Insets& work_area_insets);
 
   // Returns the display's size in pixel coordinates.
   gfx::Size GetSizeInPixel() const;
 
 #if defined(USE_AURA)
-  // TODO(oshima|skuhne): Eliminate the use of bounds_in_pixel in events_x.cc
-  // and remove bounds_in_pixel from gfx::Display.
+  // TODO(oshima|skuhne): bounds_in_pixel is no longer used in events_x.cc,
+  // bounds_in_pixel can now be removed from gfx::Display.
+  // (Some care needs to be taken in SetSize and SetScaleAndBounds).
   // Returns the display's bounds in pixel coordinates.
   const Rect& bounds_in_pixel() const { return bounds_in_pixel_; }
 #endif
 
   // Returns a string representation of the display;
   std::string ToString() const;
 
   // True if the display contains valid display id.
   bool is_valid() const { return id_ != kInvalidDisplayID; }
 
   static const int64 kInvalidDisplayID;
 
  private:
   int64 id_;
   Rect bounds_;
   Rect work_area_;
 #if defined(USE_AURA)
   Rect bounds_in_pixel_;
 #endif
   float device_scale_factor_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_DISPLAY_H_