Add experimental framework token generation tool

tools/experiments/third_party/README.chromium

Index: tools/experiments/third_party/README.chromium
diff --git a/tools/experiments/third_party/README.chromium b/tools/experiments/third_party/README.chromium
new file mode 100644
index 0000000000000000000000000000000000000000..f15197750409da16c03cb0f0fab4241c1b63be3b
--- /dev/null
+++ b/tools/experiments/third_party/README.chromium
@@ -0,0 +1,14 @@
+Name: Ed25519: high-speed high-security signatures

[davidben, 2016/01/11 20:42:02]

I suspect you need to get this reviewed by some other folks. I'm not sure how
that works.

https://www.chromium.org/developers/adding-3rd-party-libraries

(Another option is to write a C++ tool and link it against BoringSSL.)

+Short Name: Ed25519
+URL: http://ed25519.cr.yp.to/software.html
+Version: 0
+License: Public Domain
+License File: NOT_SHIPPED
+Security Critical: no
+
+Description:
+This package is used by the command-line utilities in tools/experiments to sign
+tokens for experimental API usage, and to verify the signatures on those tokens.
+
+Local Modifications:
+None.