[Autofill] Add support for signin promo on Android

chrome/browser/android/signin/signin_promo_util_android.h

+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_PROMO_UTIL_ANDROID_H_
+#define CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_PROMO_UTIL_ANDROID_H_
+
+#include "base/android/jni_android.h"
+#include "components/signin/core/browser/signin_metrics.h"
+#include "content/public/browser/android/content_view_core.h"
+
+namespace chrome {
+namespace android {
+
+class SigninPromoUtilAndroid {
+ public:
+  // Opens a signin flow with the specified |access_point| for metrics within
+  // the context of |content_view_core|, which could be null.
+  static void StartAccountSigninActivityForPromo(
+      content::ContentViewCore* content_view_core,
+      signin_metrics::AccessPoint access_point);
+
+  static bool Register(JNIEnv* env);
+};
+
+}  // namespace android
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_PROMO_UTIL_ANDROID_H_