[android] Add JobScheduler-based BackgroundTaskScheduler.

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index 884144937b35ebd539a2728534a13635ca61bfa5..747e6467037f01845a4096e3554df7038555cb25 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -161,6 +161,7 @@ android_library("chrome_java") {
     "//chrome/android/webapk/libs/common:common_java",
     "//chrome/android/webapk/libs/runtime_library:webapk_service_aidl_java",
     "//components/autofill/android:autofill_java",
+    "//components/background_task_scheduler:background_task_scheduler_java",
     "//components/bookmarks/common/android:bookmarks_java",
     "//components/dom_distiller/content/browser/android:dom_distiller_content_java",
     "//components/dom_distiller/core/android:dom_distiller_core_java",
@@ -386,6 +387,8 @@ android_library("chrome_test_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",