mojo: Fix running view-manager related apptests on X11.

ui/platform_window/x11/x11_window.cc

 // Copyright 2014 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.
 
 #include "ui/platform_window/x11/x11_window.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ skipping 20 matching lines @@
   NULL
 };
 
 XID FindXEventTarget(XEvent* xevent) {
   XID target = xevent->xany.window;
   if (xevent->type == GenericEvent)
     target = static_cast<XIDeviceEvent*>(xevent->xcookie.data)->event;
   return target;
 }
 
+bool g_override_redirect = false;
+
 }  // namespace
 
 X11Window::X11Window(PlatformWindowDelegate* delegate)
     : delegate_(delegate),
       xdisplay_(gfx::GetXDisplay()),
       xwindow_(None),
       xroot_window_(DefaultRootWindow(xdisplay_)),
       atom_cache_(xdisplay_, kAtomsToCache),
       window_mapped_(false) {
   CHECK(delegate_);
@@ skipping 65 matching lines @@
 void X11Window::Show() {
   if (window_mapped_)
     return;
 
   CHECK(PlatformEventSource::GetInstance());
   PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
 
   XSetWindowAttributes swa;
   memset(&swa, 0, sizeof(swa));
   swa.background_pixmap = None;
-  swa.override_redirect = False;
+  swa.override_redirect = g_override_redirect;
   xwindow_ = XCreateWindow(xdisplay_,
                            xroot_window_,
                            requested_bounds_.x(),
                            requested_bounds_.y(),
                            requested_bounds_.width(),
                            requested_bounds_.height(),
                            0,               // border width
                            CopyFromParent,  // depth
                            InputOutput,
                            CopyFromParent,  // visual
@@ skipping 221 matching lines @@
     }
 
     case GenericEvent: {
       ProcessXInput2Event(xev);
       break;
     }
   }
   return POST_DISPATCH_STOP_PROPAGATION;
 }
 
+namespace test {
+
+void SetUseOverrideRedirectWindowByDefault(bool override_redirect) {
+  g_override_redirect = override_redirect;
+}
+
+}  // namespace test
 }  // namespace ui