DevTools: consolidate protocol generators for front-end, backend and type builder.

third_party/WebKit/Source/platform/inspector_protocol/Dispatcher_h.template

-// This file is generated
-
-// 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 {{class_name}}_h
-#define {{class_name}}_h
-
-#include "platform/inspector_protocol/Backend.h"
-#include "platform/inspector_protocol/TypeBuilder.h"
-
-namespace blink {
-namespace protocol {
-
-class FrontendChannel;
-class DispatcherImplWeakPtr;
-
-class PLATFORM_EXPORT Dispatcher {
-public:
-    static std::unique_ptr<Dispatcher> create(FrontendChannel* frontendChannel);
-    virtual ~Dispatcher() { }
-
-{% for domain in api.domains %}
-    virtual void registerAgent(blink::protocol::{{domain.domain}}::Backend*) = 0;
-{% endfor %}
-
-    virtual void clearFrontend() = 0;
-
-    enum CommonErrorCode {
-        ParseError = 0,
-        InvalidRequest,
-        MethodNotFound,
-        InvalidParams,
-        InternalError,
-        ServerError,
-        LastEntry,
-    };
-
-    void reportProtocolError(int callId, CommonErrorCode, const String16& errorMessage) const;
-    virtual void reportProtocolError(int callId, CommonErrorCode, const String16& errorMessage, ErrorSupport*) const = 0;
-    virtual void dispatch(const String16& message) = 0;
-    static bool getCommandName(const String16& message, String16* result);
-};
-
-} // namespace protocol
-} // namespace blink
-
-#endif // !defined({{class_name}}_h)