Refactoring: Moving the SafeJsonParser to its own component.

components/safe_json_parser/safe_json_parser_messages.h

+// Copyright 2015 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.
+
+// Message definition file, included multiple times, hence no include guard.
+
+#include <string>
+#include <vector>
+
+#include "base/strings/string16.h"
+#include "content/public/common/common_param_traits.h"
+#include "content/public/common/common_param_traits_macros.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+
+#define IPC_MESSAGE_START SafeJsonParserMsgStart
+
+//------------------------------------------------------------------------------
+// Process messages:
+// This is a message from the browser to the utility process telling it to parse
+// a JSON string into a Value object.
+IPC_MESSAGE_CONTROL1(SafeJsonParserMsg_ParseJSON,
+                     std::string /* JSON to parse */)
+
+//------------------------------------------------------------------------------
+// Host messages: Reply when the utility process successfully parsed a JSON
+// string.
+//
+// WARNING: The result can be of any Value subclass type, but we can't easily
+// pass indeterminate value types by const object reference with our IPC macros,
+// so we put the result Value into a ListValue. Handlers should examine the
+// first (and only) element of the ListValue for the actual result.
+IPC_MESSAGE_CONTROL1(SafeJsonParserHostMsg_ParseJSON_Succeeded, base::ListValue)
+
+// Reply when the utility process failed in parsing a JSON string.
+IPC_MESSAGE_CONTROL1(SafeJsonParserHostMsg_ParseJSON_Failed,
+                     std::string /* error message, if any*/)