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

chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeInterfaceRegistrar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeInterfaceRegistrar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeInterfaceRegistrar.java b/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeInterfaceRegistrar.java
index ab11ffffa3560981aa66a222dbbb8b7d1c77aa23..be6cef047099d43a9c641249083d090e2f6cd72d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeInterfaceRegistrar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeInterfaceRegistrar.java
@@ -6,12 +6,14 @@ package org.chromium.chrome.browser.mojo;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.browser.payments.PaymentRequestFactory;
+import org.chromium.chrome.browser.webauth.AuthenticatorFactory;
 import org.chromium.chrome.browser.webshare.ShareServiceImplementationFactory;
 import org.chromium.content_public.browser.InterfaceRegistrar;
 import org.chromium.content_public.browser.RenderFrameHost;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.payments.mojom.PaymentRequest;
 import org.chromium.services.service_manager.InterfaceRegistry;
+import org.chromium.webauth.mojom.Authenticator;
 import org.chromium.webshare.mojom.ShareService;
 
 @SuppressWarnings("MultipleTopLevelClassesInFile")
@@ -32,6 +34,7 @@ class ChromeInterfaceRegistrar {
         public void registerInterfaces(InterfaceRegistry registry, final WebContents webContents) {
             registry.addInterface(
                     ShareService.MANAGER, new ShareServiceImplementationFactory(webContents));
+            registry.addInterface(Authenticator.MANAGER, new AuthenticatorFactory(webContents));
         }
     }