Implement a modal permission dialog on Android gated by a feature.

chrome/android/java_sources.gni

 # 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.
 
 chrome_java_sources = [
   "java/src/com/google/android/apps/chrome/appwidget/bookmarks/BookmarkThumbnailWidgetProvider.java",
   "java/src/org/chromium/chrome/browser/ActivityTabTaskDescriptionHelper.java",
   "java/src/org/chromium/chrome/browser/ActivityTaskDescriptionIconGenerator.java",
   "java/src/org/chromium/chrome/browser/AfterStartupTaskUtils.java",
   "java/src/org/chromium/chrome/browser/ApplicationInitialization.java",
@@ skipping 679 matching lines @@
   "java/src/org/chromium/chrome/browser/payments/ui/EditorView.java",
   "java/src/org/chromium/chrome/browser/payments/ui/FadingEdgeScrollView.java",
   "java/src/org/chromium/chrome/browser/payments/ui/LineItem.java",
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentInformation.java",
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentOption.java",
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestSection.java",
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java",
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUiErrorView.java",
   "java/src/org/chromium/chrome/browser/payments/ui/SectionInformation.java",
   "java/src/org/chromium/chrome/browser/payments/ui/ShoppingCart.java",
+  "java/src/org/chromium/chrome/browser/permissions/PermissionDialogController.java",
+  "java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java",
   "java/src/org/chromium/chrome/browser/physicalweb/BitmapHttpRequest.java",
   "java/src/org/chromium/chrome/browser/physicalweb/ClearNotificationAlarmReceiver.java",
   "java/src/org/chromium/chrome/browser/physicalweb/HttpRequest.java",
   "java/src/org/chromium/chrome/browser/physicalweb/JsonObjectHttpRequest.java",
   "java/src/org/chromium/chrome/browser/physicalweb/ListUrlsActivity.java",
   "java/src/org/chromium/chrome/browser/physicalweb/NearbyBackgroundSubscription.java",
   "java/src/org/chromium/chrome/browser/physicalweb/NearbyForegroundSubscription.java",
   "java/src/org/chromium/chrome/browser/physicalweb/NearbyMessageIntentService.java",
   "java/src/org/chromium/chrome/browser/physicalweb/NearbySubscription.java",
   "java/src/org/chromium/chrome/browser/physicalweb/NearbyUrlsAdapter.java",
@@ skipping 788 matching lines @@
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/SyncTestBase.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/TypedUrlsTest.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/ui/PassphraseTypeDialogFragmentTest.java",
 ]
 
 # Only used for testing, should not be shipped to end users.
 if (!is_official_build) {
   chrome_java_sources += [ "java/src/org/chromium/chrome/browser/offlinepages/evaluation/OfflinePageEvaluationBridge.java" ]
   chrome_test_java_sources += [ "javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageSavePageLaterEvaluationTest.java" ]
 }