[tool] SpnegoAuth: add multi account, credential confirmation

tools/android/kerberos/SpnegoAuthenticator/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 
 # GYP: //tools/android/kerberos:kerberos.gyp:spnego_authenticator_apk
 android_apk("spnego_authenticator_apk") {
   testonly = true
   android_manifest = "AndroidManifest.xml"
   apk_name = "SpnegoAuthenticator"
 
   deps = [
     "//base:base_java",
     "//net/android:net_java",
     ":spnego_authenticator_apk_assets",
   ]
 
   java_files = [
+    "src/org/chromium/tools/spnegoauthenticator/AccountData.java",
+    "src/org/chromium/tools/spnegoauthenticator/Constants.java",
     "src/org/chromium/tools/spnegoauthenticator/SpnegoAuthenticator.java",
+    "src/org/chromium/tools/spnegoauthenticator/SpnegoAuthenticatorActivity.java",
     "src/org/chromium/tools/spnegoauthenticator/SpnegoAuthenticatorService.java",
   ]
 }
 
 android_resources("spnego_authenticator_apk_assets") {
   testonly = true
   resource_dirs = [ "res" ]
   android_manifest = "AndroidManifest.xml"
 }