Magnifier: Prevent the cursor jumping on HiDPI display.

ash/magnifier/magnification_controller.cc

 // 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.
 
 #include "ash/magnifier/magnification_controller.h"
 
 #include "ash/ash_root_window_transformer.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
@@ skipping 26 matching lines @@
 const float kNonMagnifiedScale = 1.0f;
 
 const float kInitialMagnifiedScale = 2.0f;
 const float kScrollScaleChangeFactor = 0.05f;
 
 // Threadshold of panning. If the cursor moves to within pixels (in DIP) of
 // |kPanningMergin| from the edge, the view-port moves.
 const int kPanningMergin = 100;
 
 void MoveCursorTo(aura::RootWindow* root_window,
-                  const gfx::Point root_location) {
+                  const gfx::Point& root_location) {
   gfx::Point3F host_location_3f(root_location);
-  root_window->layer()->transform().TransformPoint(host_location_3f);
+  root_window->GetRootTransform().TransformPoint(host_location_3f);
   root_window->MoveCursorToHostLocation(
       gfx::ToCeiledPoint(host_location_3f.AsPointF()));
 }
 
 }  // namespace
 
 namespace ash {
 
 ////////////////////////////////////////////////////////////////////////////////
 // MagnificationControllerImpl:
@@ skipping 564 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // MagnificationController:
 
 // static
 MagnificationController* MagnificationController::CreateInstance() {
   return new MagnificationControllerImpl();
 }
 
 }  // namespace ash