Disable touch calibration on external touchscreen.

ui/gfx/display.h

Index: ui/gfx/display.h
diff --git a/ui/gfx/display.h b/ui/gfx/display.h
index 8b3f346902b7b9501fd2acf3ca7d662486c2c95c..58c9133e9a5cdae8794edd99f123cc36562cac73 100644
--- a/ui/gfx/display.h
+++ b/ui/gfx/display.h
@@ -89,8 +89,9 @@ class UI_EXPORT Display {
   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