Patch #1 of multiple. Add webauth .mojom and initial usage of makeCredential.

third_party/WebKit/LayoutTests/webauth/idl.html

Index: third_party/WebKit/LayoutTests/webauth/idl.html
diff --git a/third_party/WebKit/LayoutTests/webauth/idl.html b/third_party/WebKit/LayoutTests/webauth/idl.html
index 730d8cf039567e0e093a465e9f82f9d3b3188d86..8337882bd0b8d7c17f47b0acf03d5451ddc49222 100644
--- a/third_party/WebKit/LayoutTests/webauth/idl.html
+++ b/third_party/WebKit/LayoutTests/webauth/idl.html
@@ -69,7 +69,7 @@ interface ScopedCredential {
 dictionary ScopedCredentialDescriptor {
     required ScopedCredentialType type;
     required BufferSource   id;
-    sequence < Transport >  transports;
+    sequence <Transport>  transports;
 };
 
 enum Transport {
@@ -79,14 +79,14 @@ enum Transport {
 };
 [SecureContext]
 interface WebAuthentication {
-    Promise < ScopedCredentialInfo > makeCredential (
+    Promise <ScopedCredentialInfo> makeCredential (
         Account                                 accountInformation,
         sequence < ScopedCredentialParameters > cryptoParameters,
         BufferSource                            attestationChallenge,
         optional ScopedCredentialOptions        options
     );
 
-    Promise < AuthenticationAssertion > getAssertion (
+    Promise <AuthenticationAssertion> getAssertion (
         BufferSource               assertionChallenge,
         optional AssertionOptions  options
     );