athena: Add a minimal executable for just the UI.

athena/main/athena_shell.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 "athena/test/athena_test_helper.h"
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/i18n/icu_util.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "ui/aura/window_tree_host.h"
+#include "ui/compositor/test/context_factories_for_test.h"
+#include "ui/gl/gl_surface.h"
+
+class UIShell {
+ public:
+  explicit UIShell(base::MessageLoopForUI* message_loop)
+      : athena_helper_(message_loop) {
+    const bool enable_pixel_output = true;
+    ui::ContextFactory* factory =
+        ui::InitializeContextFactoryForTests(enable_pixel_output);
+    athena_helper_.SetUp(factory);
+    athena_helper_.host()->Show();
+  }
+
+ private:
+  athena::test::AthenaTestHelper athena_helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(UIShell);
+};
+
+int main(int argc, const char **argv) {
+  setlocale(LC_ALL, "");
+
+  base::AtExitManager exit_manager;
+  base::CommandLine::Init(argc, argv);
+  base::i18n::InitializeICU();
+  gfx::GLSurface::InitializeOneOffForTests();
+
+  base::MessageLoopForUI message_loop;
+  UIShell shell(&message_loop);
+  base::RunLoop run_loop;
+  run_loop.Run();
+}