Minimal athena shell main

apps/shell/browser/default_shell_browser_main_delegate.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 "apps/shell/browser/default_shell_browser_main_delegate.h"
+
+#include "apps/shell/browser/shell_extension_system.h"
+#include "base/command_line.h"
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+
+namespace apps {
+DefaultShellBrowserMainDelegate::DefaultShellBrowserMainDelegate() {
+}
+
+DefaultShellBrowserMainDelegate::~DefaultShellBrowserMainDelegate() {
+}
+
+void DefaultShellBrowserMainDelegate::Start(
+    content::BrowserContext* browser_context) {
+  const std::string kAppSwitch = "app";
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(kAppSwitch)) {
+    base::FilePath app_dir(command_line->GetSwitchValueNative(kAppSwitch));
+    base::FilePath app_absolute_dir = base::MakeAbsoluteFilePath(app_dir);
+
+    extensions::ShellExtensionSystem* extension_system =
+        static_cast<extensions::ShellExtensionSystem*>(
+            extensions::ExtensionSystem::Get(browser_context));
+    extension_system->LoadAndLaunchApp(app_absolute_dir);
+  } else {
+    LOG(ERROR) << "--" << kAppSwitch << " unset; boredom is in your future";
+  }
+}
+
+}  // namespace apps