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

ui/views/widget/desktop_aura/desktop_native_cursor_manager.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_native_cursor_manager.h"
+
+#include "ui/aura/root_window.h"
+#include "ui/base/cursor/cursor_loader.h"
+
+namespace views {
+
+DesktopNativeCursorManager::DesktopNativeCursorManager(
+    aura::RootWindow* window)
+    : root_window_(window),
+      cursor_loader_(ui::CursorLoader::Create()) {
+}
+
+DesktopNativeCursorManager::~DesktopNativeCursorManager() {
+}
+
+void DesktopNativeCursorManager::SetDeviceScaleFactor(
+    float device_scale_factor,
+    views::corewm::NativeCursorManagerDelegate* delegate) {
+  cursor_loader_->UnloadAll();
+  cursor_loader_->set_device_scale_factor(device_scale_factor);
+  SetCursor(delegate->GetCurrentCursor(), delegate);
+}
+
+void DesktopNativeCursorManager::SetCursor(
+    gfx::NativeCursor cursor,
+    views::corewm::NativeCursorManagerDelegate* delegate) {
+  gfx::NativeCursor new_cursor = cursor;
+  cursor_loader_->SetPlatformCursor(&new_cursor);
+  delegate->CommitCursor(new_cursor);
+
+  if (delegate->GetCurrentVisibility())
+    root_window_->SetCursor(new_cursor);
+}
+
+void DesktopNativeCursorManager::SetVisibility(
+    bool visible,
+    views::corewm::NativeCursorManagerDelegate* delegate) {
+  delegate->CommitVisibility(visible);
+
+  if (visible) {
+    SetCursor(delegate->GetCurrentCursor(), delegate);
+  } else {
+    gfx::NativeCursor invisible_cursor(ui::kCursorNone);
+    cursor_loader_->SetPlatformCursor(&invisible_cursor);
+    root_window_->SetCursor(invisible_cursor);
+  }
+
+  root_window_->OnCursorVisibilityChanged(visible);
+}
+
+void DesktopNativeCursorManager::SetMouseEventsEnabled(
+    bool enabled,
+    views::corewm::NativeCursorManagerDelegate* delegate) {
+  delegate->CommitMouseEventsEnabled(enabled);
+
+  // TODO(erg): In the ash version, we set the last mouse location on Env. I'm
+  // not sure this concept makes sense on the desktop.
+
+  SetVisibility(delegate->GetCurrentVisibility(), delegate);
+
+  root_window_->OnMouseEventsEnableStateChanged(enabled);
+}
+
+}  // namespace views