Translate 1 pixel not 1 dip when rotating the display.

ui/aura/root_window.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 "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 674 matching lines @@
   mouse_moved_handler_ = NULL;
   mouse_event_dispatch_target_ = NULL;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RootWindow, private:
 
 void RootWindow::TransformEventForDeviceScaleFactor(bool keep_inside_root,
                                                     ui::LocatedEvent* event) {
   event->UpdateForRootTransform(GetInverseRootTransform());
-#if defined(OS_CHROMEOS)
-  const gfx::Rect& root_bounds = bounds();
-  if (keep_inside_root &
-      host_->GetBounds().Contains(event->system_location()) &&
-      !root_bounds.Contains(event->root_location())) {
-    // Make sure that the mouse location inside the host window gets
-    // translated inside root window.
-    // TODO(oshima): This is (hopefully) short term bandaid to deal
-    // with calculation error due to the fact that we rotate in dip
-    // coordinates instead of pixels. crbug.com/222483.
-    int x = event->location().x();
-    int y = event->location().y();
-    x = std::min(std::max(x, root_bounds.x()), root_bounds.right());
-    y = std::min(std::max(y, root_bounds.y()), root_bounds.bottom());
-    const gfx::Point new_location(x, y);
-    event->set_location(new_location);
-    event->set_root_location(new_location);
-  }
-#endif  // defined(OS_CHROMEOS)
 }
 
 void RootWindow::HandleMouseMoved(const ui::MouseEvent& event, Window* target) {
   if (target == mouse_moved_handler_)
     return;
 
   DispatchMouseEnterOrExit(event, ui::ET_MOUSE_EXITED);
 
   if (mouse_event_dispatch_target_ != target) {
     mouse_moved_handler_ = NULL;
@@ skipping 458 matching lines @@
 }
 
 gfx::Transform RootWindow::GetInverseRootTransform() const {
   float scale = ui::GetDeviceScaleFactor(layer());
   gfx::Transform transform;
   transform.Scale(1.0f / scale, 1.0f / scale);
   return transformer_->GetInverseTransform() * transform;
 }
 
 }  // namespace aura