headless: Add a headless shell

headless/lib/headless_main_delegate.h

Index: headless/lib/headless_main_delegate.h
diff --git a/headless/lib/headless_main_delegate.h b/headless/lib/headless_main_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..28134d794fc6cc56ee8f630e92ae60bdf4a073b3
--- /dev/null
+++ b/headless/lib/headless_main_delegate.h
@@ -0,0 +1,50 @@
+// Copyright 2015 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.
+
+#ifndef HEADLESS_LIB_HEADLESS_MAIN_DELEGATE_H_
+#define HEADLESS_LIB_HEADLESS_MAIN_DELEGATE_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/app/content_main_delegate.h"
+#include "headless/headless_export.h"
+
+namespace headless {
+class HeadlessContentClient;
+class HeadlessContentBrowserClient;
+class HeadlessContentRendererClient;
+class HeadlessContentUtilityClient;
+
+class HEADLESS_EXPORT HeadlessMainDelegate
+    : public content::ContentMainDelegate {
+ public:
+  HeadlessMainDelegate();
+  ~HeadlessMainDelegate() override;
+
+  // ContentMainDelegate implementation:
+  bool BasicStartupComplete(int* exit_code) override;
+  void PreSandboxStartup() override;
+  int RunProcess(
+      const std::string& process_type,
+      const content::MainFunctionParams& main_function_params) override;
+  void ZygoteForked() override;
+  content::ContentBrowserClient* CreateContentBrowserClient() override;
+  content::ContentRendererClient* CreateContentRendererClient() override;
+  content::ContentUtilityClient* CreateContentUtilityClient() override;
+
+ private:
+  static void InitializeResourceBundle();
+
+  scoped_ptr<HeadlessContentClient> content_client_;
+  scoped_ptr<HeadlessContentBrowserClient> browser_client_;
+  scoped_ptr<HeadlessContentRendererClient> renderer_client_;
+  scoped_ptr<HeadlessContentUtilityClient> utility_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(HeadlessMainDelegate);
+};
+
+}  // namespace headless
+
+#endif  // HEADLESS_LIB_HEADLESS_MAIN_DELEGATE_H_