Keep root_location to be in pixels and display coordinates in WS.

services/ui/ws/cursor_location_manager.cc

 // Copyright 2017 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 "services/ui/ws/cursor_location_manager.h"
 
 #include "ui/gfx/geometry/point.h"
 
 namespace ui {
 namespace ws {
 
 CursorLocationManager::CursorLocationManager() {}
 
 CursorLocationManager::~CursorLocationManager() {}
 
 void CursorLocationManager::OnMouseCursorLocationChanged(
-    const gfx::Point& point) {
+    const gfx::Point& point_in_dip) {
   current_cursor_location_ = static_cast<base::subtle::Atomic32>(
-      (point.x() & 0xFFFF) << 16 | (point.y() & 0xFFFF));
+      (point_in_dip.x() & 0xFFFF) << 16 | (point_in_dip.y() & 0xFFFF));
   if (cursor_location_memory()) {
     base::subtle::NoBarrier_Store(cursor_location_memory(),
                                   current_cursor_location_);
   }
 }
 
 mojo::ScopedSharedBufferHandle
 CursorLocationManager::GetCursorLocationMemory() {
   if (!cursor_location_handle_.is_valid()) {
     // Create our shared memory segment to share the cursor state with our
@@ skipping 11 matching lines @@
     base::subtle::NoBarrier_Store(cursor_location_memory(),
                                   current_cursor_location_);
   }
 
   return cursor_location_handle_->Clone(
       mojo::SharedBufferHandle::AccessMode::READ_ONLY);
 }
 
 }  // namespace ws
 }  // namespace ui