Add experimental framework token generation tool

tools/origin_trials/third_party/ed25519/README.chromium

Index: tools/origin_trials/third_party/ed25519/README.chromium
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+Name: Ed25519: high-speed high-security signatures
+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/origin_trials to
+sign tokens for experimental feature usage, and to verify the signatures on
+those tokens.
+Although this package does provide cryptographic signing and verification
+capabilities, it is currently not considered security-critical. It is only used
+to sign tokens for use in unit tests, or for custom developer builds of Chrome;
+not to generate tokens usable in release Chrome builds, and not for verification
+of signatures. This classification may change if the package is used for other
+purposes in the future.
+
+Local Modifications:
+None.