DevTools: generate frontend and backend interfaces under domains.

third_party/WebKit/Source/platform/inspector_protocol/BackendCallback.h

+// Copyright (c) 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 BackendCallback_h
+#define BackendCallback_h
+
+#include "platform/PlatformExport.h"
+#include "platform/inspector_protocol/ErrorSupport.h"
+
+namespace blink {
+namespace protocol {
+
+class PLATFORM_EXPORT BackendCallback {
+public:
+    virtual ~BackendCallback() { }
+    virtual void sendFailure(const ErrorString&) = 0;
+};
+
+} // namespace platform
+} // namespace blink
+
+#endif // !defined(BackendCallback_h)