[Smart Lock] Auto sign-in snackbar UI.

chrome/browser/ui/android/snackbars/auto_signin_snackbar_controller.cc

+// 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.
+
+#include "chrome/browser/ui/android/snackbars/auto_signin_snackbar_controller.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "chrome/browser/android/tab_android.h"
+#include "jni/AutoSigninSnackbarController_jni.h"
+
+void ShowAutoSigninSnackbar(TabAndroid *tab, const base::string16& username) {
+  JNIEnv *env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> message =
+      base::android::ConvertUTF16ToJavaString(
+          env, username);
+  Java_AutoSigninSnackbarController_showSnackbar(
+      env, tab->GetJavaObject().obj(), message.obj());
+}
+
+bool RegisterAutoSigninSnackbarController(JNIEnv *env) {
+   return RegisterNativesImpl(env);
+}