aura-x11: Fix touch-calibration for multi-monitor setups.

ui/base/events/event.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_BASE_EVENTS_EVENT_H_
 #define UI_BASE_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 384 matching lines @@
              base::TimeDelta time_stamp);
 
   virtual ~TouchEvent();
 
   int touch_id() const { return touch_id_; }
   float radius_x() const { return radius_x_; }
   float radius_y() const { return radius_y_; }
   float rotation_angle() const { return rotation_angle_; }
   float force() const { return force_; }
 
+  // Calibrate the touch-point. This is useful when the touch-surface that
+  // generates the events need to be remapped to a surface of a different
+  // size. |from| is the size of the native surface, and |to| is the size
+  // of the target surface.
+  void CalibrateLocation(const gfx::Size& from, const gfx::Size& to);
+
   // Used for unit tests.
   void set_radius_x(const float r) { radius_x_ = r; }
   void set_radius_y(const float r) { radius_y_ = r; }
 
   // Overridden from LocatedEvent.
   virtual void UpdateForRootTransform(const Transform& root_transform) OVERRIDE;
 
  protected:
   void set_radius(float radius_x, float radius_y) {
     radius_x_ = radius_x;
@@ skipping 199 matching lines @@
   // This value is stored as a bitfield because the number of touch ids varies,
   // but we currently don't need more than 32 touches at a time.
   const unsigned int touch_ids_bitfield_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureEvent);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_EVENTS_EVENT_H_