This gets mojo_launcher.so a little further along toward running.

mojo/services/native_viewport/native_viewport_x11.cc

 // Copyright 2013 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 "mojo/services/native_viewport/native_viewport.h"
 
 #include <X11/Xlib.h>
 
 #include "base/message_loop/message_loop.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
@@ skipping 35 matching lines @@
         CopyFromParent,  // depth
         InputOutput,
         CopyFromParent,  // visual
         CWBackPixmap | CWOverrideRedirect,
         &swa);
 
     atom_wm_protocols_ = XInternAtom(display, "WM_PROTOCOLS", 1);
     atom_wm_delete_window_ = XInternAtom(display, "WM_DELETE_WINDOW", 1);
     XSetWMProtocols(display, window_, &atom_wm_delete_window_, 1);
 
-    // Assumes there is only one instance per process.
-    event_source_ = ui::PlatformEventSource::CreateDefault();
+    event_source_.reset(ui::PlatformEventSource::GetInstance());
+    if (!event_source_.get())
+      event_source_ = ui::PlatformEventSource::CreateDefault();
     ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
 
     delegate_->OnAcceleratedWidgetAvailable(window_);
   }
 
   virtual void Show() OVERRIDE {
     XDisplay* display = gfx::GetXDisplay();
     XMapWindow(display, window_);
     XFlush(display);
   }
@@ skipping 48 matching lines @@
 
 // static
 scoped_ptr<NativeViewport> NativeViewport::Create(
     shell::Context* context,
     NativeViewportDelegate* delegate) {
   return scoped_ptr<NativeViewport>(new NativeViewportX11(delegate)).Pass();
 }
 
 }  // namespace services
 }  // namespace mojo