Add WebAuthn bindings and client interface.

third_party/WebKit/Source/modules/webauth/BUILD.gn

Index: third_party/WebKit/Source/modules/webauth/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/webauth/BUILD.gn b/third_party/WebKit/Source/modules/webauth/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..fa4e1d751ea80ee3527186d404b296b11bdeeefc
--- /dev/null
+++ b/third_party/WebKit/Source/modules/webauth/BUILD.gn
@@ -0,0 +1,21 @@
+# 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.
+
+import("//third_party/WebKit/Source/modules/modules.gni")
+
+blink_modules_sources("webauth") {
+  sources = [
+    "AuthenticationAssertion.h",
+    "NavigatorAuth.cpp",
+    "NavigatorAuth.h",
+    "ScopedCredential.h",
+    "ScopedCredentialInfo.h",
+    "WebAuthentication.cpp",
+    "WebAuthentication.h",
+  ]
+
+  deps = [
+    "//device/usb/public/interfaces:interfaces_blink",
+  ]
+}