Encrypt certificate reports before uploading to HTTP URLs
This CL introduces a new protobuf to store encrypted
CertLoggerRequests. Serialized certificate reports are encrypted with an
AES-CTR-128-HMAC-SHA256 AEAD (from BoringSSL, thus encrypted reports are
only supported on BoringSSL platforms) before being uploaded to HTTP
endpoints. |CertificateErrorReporter::IsHttpUploadUrlSupported| allows
users of the class to set an HTTP URL if supported.
BUG=461590
Review URL: https://codereview.chromium.org/
1083493003
Cr-Commit-Position: refs/heads/master@{#326876}