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

ui/views/corewm/native_cursor_manager.h

+// Copyright (c) 2013 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.
+
+#ifndef UI_VIEWS_COREWM_NATIVE_CURSOR_MANAGER_H_
+#define UI_VIEWS_COREWM_NATIVE_CURSOR_MANAGER_H_
+
+#include "ui/views/corewm/native_cursor_manager_delegate.h"
+#include "ui/views/views_export.h"
+
+namespace views {
+namespace corewm {
+
+// Interface where platforms such as Ash or Desktop aura are notified of
+// requested changes to cursor state. When requested, implementer should tell
+// the CursorManager of any actual state changes performed through the
+// delegate.
+class VIEWS_EXPORT NativeCursorManager {
+ public:
+  virtual ~NativeCursorManager() {}
+
+  // A request to set the screen DPI. Can cause changes in the current cursor.
+  virtual void SetDeviceScaleFactor(
+      float device_scale_factor,
+      views::corewm::NativeCursorManagerDelegate* delegate) = 0;
+
+  // A request to set the cursor to |cursor|. At minimum, implementer should
+  // call NativeCursorManagerDelegate::CommitCursor() with whatever cursor is
+  // actually used.
+  virtual void SetCursor(
+      gfx::NativeCursor cursor,
+      views::corewm::NativeCursorManagerDelegate* delegate) = 0;
+
+  // A request to set the visibility of the cursor. At minimum, implementer
+  // should call NativeCursorManagerDelegate::CommitVisibility() with whatever
+  // the visibility is.
+  virtual void SetVisibility(
+    bool visible,
+    views::corewm::NativeCursorManagerDelegate* delegate) = 0;
+
+  // A request to set whether mouse events are disabled. At minimum,
+  // implementer should call NativeCursorManagerDelegate::
+  // CommitMouseEventsEnabled() with whether mouse events are actually enabled.
+  virtual void SetMouseEventsEnabled(
+      bool enabled,
+      views::corewm::NativeCursorManagerDelegate* delegate) = 0;
+};
+
+}  // namespace corewm
+}  // namespace views
+
+#endif  // UI_VIEWS_COREWM_NATIVE_CURSOR_MANAGER_H_