Repurpose views+content example into a generic multiprocess views runtime

ui/views/examples/content_client/examples_main.h

+// 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.
+
+#ifndef UI_VIEWS_EXAMPLES_CONTENT_CLIENT_EXAMPLES_MAIN_H_
+#define UI_VIEWS_EXAMPLES_CONTENT_CLIENT_EXAMPLES_MAIN_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/views/examples/views_examples_with_content_export.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace views {
+namespace examples {
+
+// Creates a multiprocess views runtime for running an example application.
+//
+// Sample usage:
+//
+// void InitMyApp(content::BrowserContext* browser_context,
+//                gfx::NativeView window_context) {
+//   // Create desired windows and views here. Runs on the UI thread.
+// }
+//
+// #if defined(OS_WIN)
+// int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t*, int) {
+//   views::examples::ExamplesMainParams params(instance);
+// #else
+// int main(int argc, const char** argv) {
+//   views::examples::ExamplesMainParams params(argc, argv);
+// #endif
+//
+//   params.set_task(base::Bind(&InitMyApp));
+//   return params.RunMain();
+// }
+class VIEWS_EXAMPLES_WITH_CONTENT_EXPORT ExamplesMainParams {
+ public:
+  typedef base::Callback<
+      void(content::BrowserContext* browser_context,
+           gfx::NativeView window_context)> Task;
+
+#if defined(OS_WIN)
+  ExamplesMainParams(HINSTANCE instance);
+#else
+  ExamplesMainParams(int argc, const char** argv);
+#endif
+
+  // Runs content::ContentMain().
+  int RunMain();
+
+  // The task to run at the end of BrowserMainParts::PreMainMessageLoopRun().
+  // Ignored if this is not the main process.
+  void set_task(const Task& task) { task_ = task; }
+  const Task& task() const { return task_; }
+
+ private:
+#if defined(OS_WIN)
+  HINSTANCE instance_;
+#else
+  int argc_;
+  const char** argv_;
+#endif
+  Task task_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExamplesMainParams);
+};
+
+}  // namespace examples
+}  // namespace views
+
+#endif  // UI_VIEWS_EXAMPLES_CONTENT_CLIENT_EXAMPLES_MAIN_H_