mojo_shell needs to have an Environment set up.

mojo/shell/desktop/mojo_main.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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"  // TODO(vtl): Remove.
 #include "base/message_loop/message_loop.h"
 #include "mojo/common/message_pump_mojo.h"  // TODO(vtl): Remove.
+#include "mojo/public/cpp/environment/environment.h"
 #include "mojo/shell/child_process.h"
 #include "mojo/shell/child_process_host.h"  // TODO(vtl): Remove.
 #include "mojo/shell/context.h"
 #include "mojo/shell/init.h"
 #include "mojo/shell/run.h"
 #include "ui/gl/gl_surface.h"
 
 namespace {
 
 // TODO(vtl): Remove.
 class TestChildProcessHostDelegate
     : public mojo::shell::ChildProcessHost::Delegate {
  public:
   TestChildProcessHostDelegate() {}
   virtual ~TestChildProcessHostDelegate() {}
   virtual void WillStart() OVERRIDE {
     VLOG(2) << "TestChildProcessHostDelegate::WillStart()";
   }
   virtual void DidStart(bool success) OVERRIDE {
     VLOG(2) << "TestChildProcessHostDelegate::DidStart(" << success << ")";
     base::MessageLoop::current()->QuitWhenIdle();
   }
 };
 
 }  // namespace
 
 int main(int argc, char** argv) {
   base::AtExitManager at_exit;
+  mojo::Environment env;
   CommandLine::Init(argc, argv);
   mojo::shell::InitializeLogging();
 
   // TODO(vtl): Move this a proper test (and remove includes marked "remove").
   if (CommandLine::ForCurrentProcess()->HasSwitch("run-test-child")) {
     base::MessageLoop message_loop(
         scoped_ptr<base::MessagePump>(new mojo::common::MessagePumpMojo()));
 
     mojo::shell::Context context;
     TestChildProcessHostDelegate child_process_host_delegate;
@@ skipping 17 matching lines @@
 
     base::MessageLoop message_loop;
     mojo::shell::Context context;
     message_loop.PostTask(FROM_HERE, base::Bind(mojo::shell::Run, &context));
 
     message_loop.Run();
   }
 
   return 0;
 }