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When handling makeCredential requests in the caBLEv2 authenticator, pass
request arguments from the native side where they are unmarshaled over
to the Java side, so they can be used to construct the GMSCore FIDO API
request. When receiving a response from the FIDO API, pass response
parameters back to native code where they are converted into a CTAP
response. Both sides were previously using hard-coded fake data.

Move CtapMakeCredentialRequest and CtapGetAssertionRequest parsing code
out of VirtualCtap2Device so that caBLEv2 authenticator native code can
reuse them. Add a Parse() factory method to AttestationObject because
the native code needs to parse the CBOR Java response from Java in order
to convert it into a CTAP message.

Also switch native code to make use of //base/android JNI type
conversion helpers throughout.

Bug: 1002262
Change-Id: Ie24adec8c2b8f64e4330aa1fc4b3bf8a273617e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2109037
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751907}