Add the Mojo implementation of authenticator.mojom's MakeCredential.

components/webauth/authenticator.mojom

Index: components/webauth/authenticator.mojom
diff --git a/components/webauth/authenticator.mojom b/components/webauth/authenticator.mojom
index 1bf69a9796dadf18fd326a94ff19cd322f144fb5..4a38c14ca6919bbe52e5bd8ff5b042f7cbd5ed1e 100644
--- a/components/webauth/authenticator.mojom
+++ b/components/webauth/authenticator.mojom
@@ -10,6 +10,15 @@ module webauth.mojom;
 // and use already-created credentials to get assertions.
 // See https://w3c.github.io/webauthn/.
 
+enum AuthenticatorStatus {
+  SUCCESS,
+  CANCELLED,
+  UNKNOWN_ERROR,
+  NOT_ALLOWED_ERROR,
+  NOT_SUPPORTED_ERROR,
+  SECURITY_ERROR,
+};
+
 // The public key and attestation that is returned by an authenticator's 
 // call to makeCredential.
 struct ScopedCredentialInfo {
@@ -24,7 +33,6 @@ struct ScopedCredentialInfo {
 // relying party. This information is used by the authenticator to create 
 // or retrieve an appropriate scoped credential for this account.
 // These fields take arbitrary input.
-
 struct RelyingPartyAccount {
   // Friendly name of the Relying Party, e.g. "Acme Corporation"
   string relying_party_display_name;
@@ -34,10 +42,10 @@ struct RelyingPartyAccount {
   // per authenticator and Relying Party.
   string id;
   // Detailed name for the account, e.g. john.p.smith@example.com
-  string name;
+  string? name;
   // User image, if any.
-  // Todo make this url.mojom.Url in a followup CL
-  string image_url;
+  // TODO(kpaulhamus): make this url.mojom.Url in a followup CL
+  string? image_url;
 };
 
 // Parameters that are used to generate an appropriate scoped credential.
@@ -49,8 +57,8 @@ struct ScopedCredentialParameters {
 // Optional parameters that are used during makeCredential. 
 struct ScopedCredentialOptions {
   //TODO(kpaulhamus): Make this mojo.common.mojom.TimeDelta in followup CL
-  int32 timeout_seconds;
-  string relying_party_id;
+  double adjusted_timeout;
+  string? relying_party_id;
   array<ScopedCredentialDescriptor> exclude_list;
   // TODO(kpaulhamus): add Extensions
 };
@@ -84,6 +92,7 @@ interface Authenticator {
   MakeCredential(RelyingPartyAccount account_information,
                  array<ScopedCredentialParameters> crypto_parameters,
                  array<uint8> attestation_challenge,
-                 ScopedCredentialOptions? options)
-      => (array<ScopedCredentialInfo> scoped_credentials);
+                 ScopedCredentialOptions options)
+      => (AuthenticatorStatus status, 
+          ScopedCredentialInfo? scoped_credential);
 };