Implement cursor changing on Mushrome

ash/wm/native_cursor_manager_ash_mus.h

Index: ash/wm/native_cursor_manager_ash_mus.h
diff --git a/ash/wm/native_cursor_manager_ash_mus.h b/ash/wm/native_cursor_manager_ash_mus.h
new file mode 100644
index 0000000000000000000000000000000000000000..58a9e81a9ddfac3fa0198439786077395bb81311
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+++ b/ash/wm/native_cursor_manager_ash_mus.h
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+// 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.
+
+#ifndef ASH_WM_NATIVE_CURSOR_MANAGER_ASH_MUS_H_
+#define ASH_WM_NATIVE_CURSOR_MANAGER_ASH_MUS_H_
+
+#include "ash/wm/native_cursor_manager_ash.h"
+
+namespace ui {
+class CursorDataFactoryOzone;
+class ImageCursors;
+}  // namespace ui
+
+namespace ash {
+
+// An NativeCursorManagerAsh which is used in Mushrome mode.
+//
+// NativeCursorManagerAshClassic implicitly communicates with ozone via
+// ImageCursors and the window tree host, but in mushrome, we want to
+// communicate with the window server purely through the mus interfaces.
+//
+// This doesn't mean that we can just cut out all ozone communication; we'll
+// have to do what the mash does, which is install just the cursor factory part
+// of ozone.
+class ASH_EXPORT NativeCursorManagerAshMus : public NativeCursorManagerAsh {
+ public:
+  NativeCursorManagerAshMus();
+  ~NativeCursorManagerAshMus() override;
+
+ private:
+  // Overridden from NativeCursorManagerAsh:
+  void SetNativeCursorEnabled(bool enabled) override;
+  float GetScale() const override;
+  display::Display::Rotation GetRotation() const override;
+
+  // Overridden from ::wm::NativeCursorManager:
+  void SetDisplay(const display::Display& display,
+                  ::wm::NativeCursorManagerDelegate* delegate) override;
+  void SetCursor(gfx::NativeCursor cursor,
+                 ::wm::NativeCursorManagerDelegate* delegate) override;
+  void SetVisibility(bool visible,
+                     ::wm::NativeCursorManagerDelegate* delegate) override;
+  void SetCursorSet(ui::CursorSetType cursor_set,
+                    ::wm::NativeCursorManagerDelegate* delegate) override;
+  void SetMouseEventsEnabled(
+      bool enabled,
+      ::wm::NativeCursorManagerDelegate* delegate) override;
+
+  // The cursor location where the cursor was disabled.
+  gfx::Point disabled_cursor_location_;
+
+  bool native_cursor_enabled_ = true;
+
+#if defined(USE_OZONE)
+  std::unique_ptr<ui::CursorDataFactoryOzone> cursor_factory_ozone_;
+#endif
+
+  // Always nullptr when USE_OZONE is false.
+  std::unique_ptr<::ui::ImageCursors> image_cursors_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeCursorManagerAshMus);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_NATIVE_CURSOR_MANAGER_ASH_MUS_H_