third_party: add microsoft_webauthn

This imports https://github.com/Microsoft/webauthn into //third_party.

Bug: 898718
Change-Id: I71da8a1528475e5c287f2f2dbf549f8b9414a8da
Reviewed-on: https://chromium-review.googlesource.com/c/1320202Reviewed-by: Justin Schuh <jschuh@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#605860}

third_party/microsoft_webauthn/.gitignore

+## Ignore Visual Studio temporary files, build results, and
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+
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+paket-files/
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+
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+# MSBuild Binary and Structured Log
+*.binlog
+
+# NVidia Nsight GPU debugger configuration file
+*.nvuser
+
+# MFractors (Xamarin productivity tool) working folder 
+.mfractor/

third_party/microsoft_webauthn/LICENSE

+    MIT License
+
+    Copyright (c) Microsoft Corporation. All rights reserved.
+
+    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/microsoft_webauthn/OWNERS

+file://device/fido/OWNERS

third_party/microsoft_webauthn/README.chromium

+Name: Headers for the Windows 10 WebAuthn API (webauthn.dll)
+Short Name: Windows webauthn.h
+URL: https://github.com/Microsoft/webauthn/
+Version: 0
+Revision: 72ffeb914cba9fc5363b116f0ce7febc9d81e7d9
+License: MIT
+License File: LICENSE
+Security Critical: no
+
+Description:
+This project contains a header file (webauthn.h) for the native Windows 10
+WebAuthn API (webauthn.dll). While the API is already shipping with Windows 10
+Insider Preview builds (as of November 2018), the corresponding header file has
+not yet been released into a Windows SDK that Chromium can depend on. We
+therefore include the header via this open source repository for the time
+being.
+
+Local Modifications: none

third_party/microsoft_webauthn/README.md

+# Description
+
+This project includes Win32 headers for communicating to Windows Hello and external secruity keys as part of WebAuthN and CTAP specification.
+
+For more details about the standards, please follow these links:
+* WebAuthN: https://w3c.github.io/webauthn/
+* CTAP: https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-client-to-authenticator-protocol-v2.0-id-20180227.html
+
+
+# Having Issues?
+If you have any issues in adopting these APIs or need some clarification, please contact [FIDO OS Security Group](FIDOSEC@microsoft.com)
+
+
+# Contributing
+
+This project welcomes contributions and suggestions.  Most contributions require you to agree to a
+Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
+the rights to use your contribution. For details, visit https://cla.microsoft.com.
+
+When you submit a pull request, a CLA-bot will automatically determine whether you need to provide
+a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions
+provided by the bot. You will only need to do this once across all repos using our CLA.
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
+contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.