Add logs when requests are proxied to WebAuthn

Whenever a request is received by cryptotoken,
and that request is then proxied to WebAuthn,
log this instance to the background console.

Change-Id: I180f6fbbd3b512dab9f4549742b52f97a36542f1
Reviewed-on: https://chromium-review.googlesource.com/c/1371084Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Commit-Queue: Casey Piper <piperc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615418}

chrome/browser/resources/cryptotoken/enroller.js

@@ -830,6 +830,7 @@ Enroller.prototype.sendEnrollRequestToHelper_ = function() {
 
         if (v2Challenge && shouldUseWebAuthn) {
           // If we can proxy to WebAuthn, send the request via WebAuthn.
+          console.log('Proxying registration request to WebAuthn');
           this.doRegisterWebAuthn_(enrollAppIds[0], v2Challenge, request);
         } else {
           self.handler_ =

chrome/browser/resources/cryptotoken/signer.js

@@ -465,6 +465,7 @@ Signer.prototype.doSign_ = async function() {
   }).then(shouldUseWebAuthn => {
     if (shouldUseWebAuthn) {
       // If we can proxy to WebAuthn, send the request via WebAuthn.
+      console.log('Proxying sign request to WebAuthn');
       return this.doSignWebAuthn_(encodedChallenges, challengeVal);
     }
     var request = makeSignHelperRequest(