Use XGrabPointer instead of XChangeActivatePointerGrab() to change the cursor during a pointer grab

ui/views/widget/desktop_aura/x11_pointer_grab.h

Index: ui/views/widget/desktop_aura/x11_pointer_grab.h
diff --git a/ui/views/widget/desktop_aura/x11_pointer_grab.h b/ui/views/widget/desktop_aura/x11_pointer_grab.h
new file mode 100644
index 0000000000000000000000000000000000000000..3bae5665c5b5813b4651610751d7c28011fe1fac
--- /dev/null
+++ b/ui/views/widget/desktop_aura/x11_pointer_grab.h
@@ -0,0 +1,23 @@
+// Copyright 2015 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_WIDGET_DESKTOP_AURA_X11_POINTER_GRAB_H_
+#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_POINTER_GRAB_H_
+
+#include "ui/gfx/x/x11_types.h"
+
+typedef unsigned long Cursor;
+
+namespace views {
+
+// Grabs the pointer. It is unnecessary to ungrab the pointer prior to grabbing
+// it.
+int GrabPointer(XID window, bool owner_events, ::Cursor cursor);
+
+// Ungrabs the pointer.
+void UngrabPointer();
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_POINTER_GRAB_H_