Headless utility classes for making deterministic protocol handlers

headless/public/util/expedited_dispatcher.h

Index: headless/public/util/expedited_dispatcher.h
diff --git a/headless/public/util/expedited_dispatcher.h b/headless/public/util/expedited_dispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..39b8057fdfc5656bad3e94c3f41d61674a4b9c52
--- /dev/null
+++ b/headless/public/util/expedited_dispatcher.h
@@ -0,0 +1,41 @@
+// Copyright 2016 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_PUBLIC_UTIL_EXPEDITED_DISPATCHER_H_
+#define HEADLESS_PUBLIC_UTIL_EXPEDITED_DISPATCHER_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
+#include "headless/public/util/url_request_dispatcher.h"
+#include "net/base/net_errors.h"
+
+namespace headless {
+
+class ManagedDispatchURLRequestJob;
+
+// This class dispatches calls to OnHeadersComplete and OnStartError
+// immediately sacrificing determinism for performance.
+class ExpeditedDispatcher : public URLRequestDispatcher {
+ public:
+  explicit ExpeditedDispatcher(
+      scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner);
+  ~ExpeditedDispatcher() override;
+
+  // UrlRequestDispatcher implementation:
+  void JobCreated(ManagedDispatchURLRequestJob* job) override;
+  void JobKilled(ManagedDispatchURLRequestJob* job) override;
+  void JobFailed(ManagedDispatchURLRequestJob* job, net::Error error) override;
+  void DataReady(ManagedDispatchURLRequestJob* job) override;
+  void JobDeleted(ManagedDispatchURLRequestJob* job) override;
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExpeditedDispatcher);
+};
+
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_UTIL_EXPEDITED_DISPATCHER_H_