Headless: make URLRequestDispatcher aware of navigations

headless/public/util/navigation_request.h

+// Copyright 2017 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_NAVIGATION_REQUEST_H_
+#define HEADLESS_PUBLIC_UTIL_NAVIGATION_REQUEST_H_
+
+#include "base/macros.h"
+
+namespace headless {
+
+// While the actual details of the navigation processing are left undefined,
+// it's anticipated implementations will use devtools Page.setControlNavigations
+// and Page.processNavigation commands.
+class NavigationRequest {
+ public:
+  NavigationRequest() {}
+  virtual ~NavigationRequest() {}
+
+  // Called on the IO thread to ask the implementation to start processing the
+  // navigation request. The NavigationRequest will be deleted immediately after
+  // The |done_callback| can be called from any thread.
+  virtual void StartProcessing(base::Closure done_callback) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NavigationRequest);
+};
+
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_UTIL_NAVIGATION_REQUEST_H_