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

ui/base/x/x11_util.h

Index: ui/base/x/x11_util.h
diff --git a/ui/base/x/x11_util.h b/ui/base/x/x11_util.h
index ffcf8461c75613fe43ba39aeec23b08db6c298ed..aafbf65aa322319297c10ef541c66124239b7ff2 100644
--- a/ui/base/x/x11_util.h
+++ b/ui/base/x/x11_util.h
@@ -45,6 +45,13 @@ namespace ui {
 // Returns true if the system supports XINPUT2.
 UI_BASE_EXPORT bool IsXInput2Available();
 
+// Grabs the pointer. It is unnecessary to ungrab the pointer prior to grabbing
+// it.
+UI_BASE_EXPORT int GrabPointer(XID window, bool owner_events, ::Cursor cursor);
+
+// Ungrabs the pointer.
+UI_BASE_EXPORT void UngrabPointer();
+
 // X shared memory comes in three flavors:
 // 1) No SHM support,
 // 2) SHM putimage,