[android] Add JobScheduler-based BackgroundTaskScheduler.

chrome/android/BUILD.gn

 # Copyright 2014 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("//android_webview/webview_repack_locales_list.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/util/process_version.gni")
 import("//chrome/android/chrome_public_apk_tmpl.gni")
 import("//chrome/android/monochrome_android_manifest_jinja_variables.gni")
@@ skipping 368 matching lines @@
 
   deps = [
     "//base:base_java",
     "//base:base_java_test_support",
     "//chrome/android:chrome_java",
     "//chrome/android/webapk/libs/client:client_java",
     "//chrome/android/webapk/libs/common:common_java",
     "//chrome/android/webapk/libs/runtime_library:webapk_service_aidl_java",
     "//chrome/test/android:chrome_java_test_support",
     "//components/autofill/android:autofill_java",
+    "//components/background_task_scheduler:background_task_scheduler_java",
+    "//components/background_task_scheduler:background_task_scheduler_javatests",
     "//components/bookmarks/common/android:bookmarks_java",
     "//components/dom_distiller/core/android:dom_distiller_core_java",
     "//components/gcm_driver/android:gcm_driver_java",
     "//components/gcm_driver/instance_id/android:instance_id_driver_java",
     "//components/gcm_driver/instance_id/android:instance_id_driver_test_support_java",
     "//components/invalidation/impl:java",
     "//components/invalidation/impl:javatests",
     "//components/location/android:location_java",
     "//components/minidump_uploader:minidump_uploader_java",
     "//components/minidump_uploader:minidump_uploader_javatests",
@@ skipping 431 matching lines @@
   apk_name = "ChromeSyncShellTest"
   apk_under_test = ":chrome_sync_shell_apk"
   android_manifest = chrome_sync_shell_test_apk_manifest
   android_manifest_dep = ":chrome_sync_shell_test_apk_manifest"
   deps = [
     ":chrome_sync_shell_test_apk_java",
     "//third_party/android_support_test_runner:runner_java",
   ]
   proguard_enabled = !is_java_debug
 }