DevTools: Build release mode using JS and Python

third_party/WebKit/Source/devtools/scripts/js_build/ConcatenateProtocols.js

+// 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.
+
+var path = require("path");
+
+var jsonfile = require("jsonfile");
+
+var utils = require("../utils");
+
+module.exports = function main(protocols, output)
+{
+    var domains = [];
+    var version;
+    for (var i = 0; i < protocols.length; i++) {
+        var protocol = protocols[i];
+        if (!utils.isFile(protocol))
+            throw new Error(`Cannot find ${protocol}`);
+        var json = require(protocol);
+        domains = domains.concat(json.domains);
+        version = json.version;
+    }
+    var combinedProtocol = {
+        version,
+        domains
+    };
+    jsonfile.writeFileSync(output, combinedProtocol, {spaces: 4});
+};