Add vulcanize to tools.

tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/node_modules/readable-stream/test/simple/test-stream2-unpipe-drain.js

Index: tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/node_modules/readable-stream/test/simple/test-stream2-unpipe-drain.js
diff --git a/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/node_modules/readable-stream/test/simple/test-stream2-unpipe-drain.js b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/node_modules/readable-stream/test/simple/test-stream2-unpipe-drain.js
new file mode 100644
index 0000000000000000000000000000000000000000..a3b5394542f15a19fe2862a82e76e01dfe110081
--- /dev/null
+++ b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/node_modules/readable-stream/test/simple/test-stream2-unpipe-drain.js
@@ -0,0 +1,76 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+var common = require('../common.js');
+var assert = require('assert');
+var stream = require('../../readable');
+var crypto = require('crypto');
+
+var util = require('util');
+
+function TestWriter() {
+    stream.Writable.call(this);
+}
+util.inherits(TestWriter, stream.Writable);
+
+TestWriter.prototype._write = function (buffer, encoding, callback) {
+  console.log('write called');
+  // super slow write stream (callback never called)
+};
+
+var dest = new TestWriter();
+
+function TestReader(id) {
+    stream.Readable.call(this);
+    this.reads = 0;
+}
+util.inherits(TestReader, stream.Readable);
+
+TestReader.prototype._read = function (size) {
+  this.reads += 1;
+  this.push(crypto.randomBytes(size));
+};
+
+var src1 = new TestReader();
+var src2 = new TestReader();
+
+src1.pipe(dest);
+
+src1.once('readable', function () {
+  process.nextTick(function () {
+
+    src2.pipe(dest);
+
+    src2.once('readable', function () {
+      process.nextTick(function () {
+
+        src1.unpipe(dest);
+      });
+    });
+  });
+});
+
+
+process.on('exit', function () {
+  assert.equal(src1.reads, 2);
+  assert.equal(src2.reads, 2);
+});