Add PermissionPromptAndroid skeleton

chrome/browser/ui/android/infobars/grouped_permission_infobar.cc

 // 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.
 
 #include "chrome/browser/ui/android/infobars/grouped_permission_infobar.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "chrome/browser/android/resource_mapper.h"
@@ skipping 70 matching lines @@
 
 void GroupedPermissionInfoBar::SetJavaInfoBar(
     const base::android::JavaRef<jobject>& java_info_bar) {
   InfoBarAndroid::SetJavaInfoBar(java_info_bar);
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_GroupedPermissionInfoBar_setNativePtr(env, java_info_bar,
                                              reinterpret_cast<intptr_t>(this));
 }
 
 GroupedPermissionInfoBarDelegate* GroupedPermissionInfoBar::GetDelegate() {
-  return static_cast<GroupedPermissionInfoBarDelegate*>(delegate());
+  return delegate()->AsGroupedPermissionInfoBarDelegate();
 }