TaskScheduler: Delegate instead of callbacks for SchedulerWorkerThread.

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 749 matching lines @@
     "task_runner.cc",
     "task_runner.h",
     "task_runner_util.h",
     "task_scheduler/priority_queue.cc",
     "task_scheduler/priority_queue.h",
     "task_scheduler/scheduler_lock.h",
     "task_scheduler/scheduler_lock_impl.cc",
     "task_scheduler/scheduler_lock_impl.h",
     "task_scheduler/scheduler_worker_thread.cc",
     "task_scheduler/scheduler_worker_thread.h",
+    "task_scheduler/scheduler_worker_thread_delegate.h",
     "task_scheduler/sequence.cc",
     "task_scheduler/sequence.h",
     "task_scheduler/sequence_sort_key.cc",
     "task_scheduler/sequence_sort_key.h",
     "task_scheduler/task.cc",
     "task_scheduler/task.h",
     "task_scheduler/task_tracker.cc",
     "task_scheduler/task_tracker.h",
     "task_scheduler/task_traits.cc",
     "task_scheduler/task_traits.h",
@@ skipping 1537 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }