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

third_party/WebKit/Source/modules/webauth/WebAuthentication.h

Index: third_party/WebKit/Source/modules/webauth/WebAuthentication.h
diff --git a/third_party/WebKit/Source/modules/webauth/WebAuthentication.h b/third_party/WebKit/Source/modules/webauth/WebAuthentication.h
index 2ffff0fea4c3722a589044fa2259c558f6c94c9f..633f6a7ab74d0b0c5150700ac9ac218786fa026c 100644
--- a/third_party/WebKit/Source/modules/webauth/WebAuthentication.h
+++ b/third_party/WebKit/Source/modules/webauth/WebAuthentication.h
@@ -29,6 +29,7 @@ class WebAuthentication final
       public ContextLifecycleObserver {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(WebAuthentication);
+  USING_PRE_FINALIZER(WebAuthentication, Dispose);

[haraken, 2017/04/13 01:59:40]

What is it for? The Dispose method is empty.

 
  public:
   static WebAuthentication* Create(LocalFrame& frame) {
@@ -49,24 +50,26 @@ class WebAuthentication final
                              const BufferSource&,
                              const AuthenticationAssertionOptions&);
 
-  // ContextLifecycleObserver overrides.
-  void ContextDestroyed(ExecutionContext*) override;
-
   webauth::mojom::blink::Authenticator* authenticator() const {
     return m_authenticator.get();
   }
 
-  void onMakeCredential(ScriptPromiseResolver*,
-                        Vector<webauth::mojom::blink::ScopedCredentialInfoPtr>);
-  bool markRequestComplete(ScriptPromiseResolver*);
-
-  void onAuthenticatorConnectionError();
+  // ContextLifecycleObserver overrides.
+  void ContextDestroyed(ExecutionContext*) override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit WebAuthentication(LocalFrame&);
 
+  void onMakeCredential(ScriptPromiseResolver*,
+                        webauth::mojom::blink::AuthenticatorStatus,
+                        webauth::mojom::blink::ScopedCredentialInfoPtr);
+  ScriptPromise rejectIfNotSupported(ScriptState*);
+  void onAuthenticatorConnectionError();
+  bool markRequestComplete(ScriptPromiseResolver*);
+  void cleanup();
+
   webauth::mojom::blink::AuthenticatorPtr m_authenticator;
   HeapHashSet<Member<ScriptPromiseResolver>> m_authenticatorRequests;
 };