Adding src/third_party/chaijs (Javascript assertion library).

Review URL: https://codereview.chromium.org/1468253004

Cr-Commit-Position: refs/heads/master@{#362860}

Author: freshp86

third_party/chaijs/LICENSE

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+(Copied from https://github.com/chaijs/chai/blob/master/README.md).
+--------------------------------------------------------------------------------
+Copyright (c) 2011-2015 Jake Luer jake@alogicalparadox.com
+
+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.

third_party/chaijs/OWNERS

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+dpapad@chromium.org
+dbeam@chromium.org

third_party/chaijs/README.chromium

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+Name: Chai Assertion Library
+Short Name: chai
+URL: https://github.com/chaijs/chai
+Version: 3.4.1
+Revision: 12bfdd17648e2b3e11d64e5b926007a6d84bfbe8
+Date: Mon Nov 23 17:06:02 2015 +0000
+License: MIT
+License File: NOT_SHIPPED
+Security Critical: no
+
+Description:
+BDD / TDD assertion framework for node.js and the browser that can be
+paired with any testing framework.
+
+Local Modifications:
+Copied license text out of README.md.