Move OnCursorChange from CefRenderHandler to CefDisplayHandler

The cursor change can now be handled by the client with both windowed and
off-screen rendering.

Returning true from OnCursorChange will disable the default cursor change
behavior. This is functionally equivalent to the
CefBrowserHost::SetMouseCursorChangeDisabled method, so that method has been
removed.

libcef/browser/native/cursor_util.h

@@ -0,0 +1,27 @@
+// Copyright 2020 The Chromium Embedded Framework 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 CEF_LIBCEF_BROWSER_NATIVE_CURSOR_UTIL_H_
+#define CEF_LIBCEF_BROWSER_NATIVE_CURSOR_UTIL_H_
+
+#include "include/internal/cef_types.h"
+
+#include "ui/base/cursor/cursor.h"
+#include "ui/base/cursor/mojom/cursor_type.mojom-forward.h"
+
+class CefBrowserHostBase;
+
+namespace cursor_util {
+
+#if defined(USE_AURA)
+cef_cursor_handle_t GetPlatformCursor(ui::mojom::CursorType type);
+cef_cursor_handle_t ToCursorHandle(ui::PlatformCursor cursor);
+#endif  // defined(USE_AURA)
+
+// Returns true if the client handled the cursor change.
+bool OnCursorChange(CefBrowserHostBase* browser, const ui::Cursor& ui_cursor);
+
+}  // namespace cursor_util
+
+#endif  // CEF_LIBCEF_BROWSER_NATIVE_CURSOR_UTIL_H_