Animates touch points on screen tap during touch calibration

chrome/browser/chromeos/display/touch_calibrator/touch_calibrator_controller.cc

 // Copyright 2016 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 "chrome/browser/chromeos/display/touch_calibrator/touch_calibrator_controller.h"
 
 #include "ash/shell.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/chromeos/display/touch_calibrator/touch_calibrator_view.h"
 #include "ui/display/screen.h"
@@ skipping 107 matching lines @@
       // Return early if the interface is in a state that does not allow user
       // interaction.
       return;
   }
 
   // Store touch point corresponding to its display point.
   gfx::Point display_point;
   if (target_screen_calibration_view->GetDisplayPointLocation(&display_point)) {
     touch_point_quad_[state_index] =
         std::make_pair(display_point, touch->location());
+  } else {
+    // TODO(malaykeshav): Display some kind of error for the user.
+    NOTREACHED() << "Touch calibration failed. Could not retrieve location for"
+                    " display point. Retry calibration.";
   }
 
   // If this is the final state, then store all calibration data and stop
   // calibration.
   if (target_screen_calibration_view->state() ==
       TouchCalibratorView::CALIBRATION_COMPLETE) {
     ash::Shell::GetInstance()->display_manager()->SetTouchCalibrationData(
         target_display_.id(), touch_point_quad_,
         target_screen_calibration_view->size());
     StopCalibration();
     return;
   }
 
   target_screen_calibration_view->AdvanceToNextState();
 }
 
 }  // namespace chromeos