headless: Implement client API generation

headless/public/internal/message_dispatcher.h

+// 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_INTERNAL_MESSAGE_DISPATCHER_H_
+#define HEADLESS_PUBLIC_INTERNAL_MESSAGE_DISPATCHER_H_
+
+namespace headless {
+namespace internal {
+
+// An internal interface for sending DevTools messages from the domain agents.
+class MessageDispatcher {
+ public:
+  virtual void SendMessage(
+      const char* method,
+      std::unique_ptr<base::Value> params,
+      base::Callback<void(const base::Value&)> callback) = 0;
+  virtual void SendMessage(const char* method,
+                           std::unique_ptr<base::Value> params,
+                           base::Callback<void()> callback) = 0;
+  virtual void SendMessage(
+      const char* method,
+      base::Callback<void(const base::Value&)> callback) = 0;
+  virtual void SendMessage(const char* method,
+                           base::Callback<void()> callback) = 0;
+};
+
+}  // namespace internal
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_INTERNAL_MESSAGE_DISPATCHER_H_