Rework ash::CursorManager into a corewm object, to share code with desktop.

ui/views/widget/desktop_aura/desktop_cursor_client.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/views/widget/desktop_aura/desktop_cursor_client.h"
-
-#include "ui/aura/root_window.h"
-#include "ui/base/cursor/cursor_loader.h"
-
-namespace views {
-
-DesktopCursorClient::DesktopCursorClient(aura::RootWindow* window)
-    : root_window_(window),
-      cursor_loader_(ui::CursorLoader::Create()),
-      current_cursor_(ui::kCursorNone),
-      cursor_visible_(true) {
-}
-
-DesktopCursorClient::~DesktopCursorClient() {
-}
-
-void DesktopCursorClient::SetCursor(gfx::NativeCursor cursor) {
-  current_cursor_ = cursor;
-  cursor_loader_->SetPlatformCursor(&current_cursor_);
-  if (cursor_visible_)
-    root_window_->SetCursor(current_cursor_);
-}
-
-void DesktopCursorClient::ShowCursor() {
-  SetCursorVisibility(true);
-}
-
-void DesktopCursorClient::HideCursor() {
-  SetCursorVisibility(false);
-}
-
-bool DesktopCursorClient::IsCursorVisible() const {
-  return cursor_visible_;
-}
-
-void DesktopCursorClient::EnableMouseEvents() {
-  // TODO(mazda): Implement this.
-  NOTIMPLEMENTED();
-}
-
-void DesktopCursorClient::DisableMouseEvents() {
-  // TODO(mazda): Implement this.
-  NOTIMPLEMENTED();
-}
-
-bool DesktopCursorClient::IsMouseEventsEnabled() const {
-  // TODO(mazda): Implement this.
-  NOTIMPLEMENTED();
-  return true;
-}
-
-void DesktopCursorClient::SetDeviceScaleFactor(float device_scale_factor) {
-  cursor_loader_->UnloadAll();
-  cursor_loader_->set_device_scale_factor(device_scale_factor);
-}
-
-void DesktopCursorClient::LockCursor() {
-  // TODO(mazda): Implement this.
-  NOTIMPLEMENTED();
-}
-
-void DesktopCursorClient::UnlockCursor() {
-  // TODO(mazda): Implement this.
-  NOTIMPLEMENTED();
-}
-
-void DesktopCursorClient::SetCursorVisibility(bool visible) {
-  if (cursor_visible_ == visible)
-    return;
-  cursor_visible_ = visible;
-  root_window_->SetCursor(current_cursor_);
-  root_window_->OnCursorVisibilityChanged(visible);
-}
-
-}  // namespace views