Implement cursor changing on Mushrome

ash/wm/native_cursor_manager_ash.h

Index: ash/wm/native_cursor_manager_ash.h
diff --git a/ash/wm/native_cursor_manager_ash.h b/ash/wm/native_cursor_manager_ash.h
new file mode 100644
index 0000000000000000000000000000000000000000..28756c5a335d4308c3aac8625ac446f3fe55f74d
--- /dev/null
+++ b/ash/wm/native_cursor_manager_ash.h
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+// 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.
+
+#ifndef ASH_WM_NATIVE_CURSOR_MANAGER_ASH_H_
+#define ASH_WM_NATIVE_CURSOR_MANAGER_ASH_H_
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+#include "ui/display/display.h"
+#include "ui/wm/core/native_cursor_manager.h"
+#include "ui/wm/core/native_cursor_manager_delegate.h"
+
+namespace ash {
+
+// Ash specific extensions to NativeCursorManager. This lets us switch whether
+// we're using the native cursor, along with exposing additional data about how
+// we're going to render cursors.
+class ASH_EXPORT NativeCursorManagerAsh : public ::wm::NativeCursorManager {
+ public:
+  ~NativeCursorManagerAsh() override = default;
+
+  // Toggle native cursor enabled/disabled.
+  // The native cursor is enabled by default. When disabled, we hide the native
+  // cursor regardless of visibility state, and let CursorWindowManager draw
+  // the cursor.
+  virtual void SetNativeCursorEnabled(bool enabled) = 0;
+
+  // Returns the scale and rotation of the currently loaded cursor.
+  virtual float GetScale() const = 0;
+  virtual display::Display::Rotation GetRotation() const = 0;
+
+ protected:
+  NativeCursorManagerAsh() = default;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativeCursorManagerAsh);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_NATIVE_CURSOR_MANAGER_ASH_H_