base: Make it possible to replace the MessageLoop's task runner

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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 299 matching lines @@
     "mac/scoped_nsobject.h",
     "mac/scoped_objc_class_swizzler.h",
     "mac/scoped_objc_class_swizzler.mm",
     "mac/scoped_sending_event.h",
     "mac/scoped_sending_event.mm",
     "mac/sdk_forward_declarations.h",
     "mac/sdk_forward_declarations.mm",
     "macros.h",
     "md5.cc",
     "md5.h",
+    "message_loop/bindable_single_thread_task_runner.h",
     "message_loop/incoming_task_queue.cc",
     "message_loop/incoming_task_queue.h",
     "message_loop/message_loop.cc",
     "message_loop/message_loop.h",
     "message_loop/message_loop_task_runner.cc",
     "message_loop/message_loop_task_runner.h",
     "message_loop/message_pump.cc",
     "message_loop/message_pump.h",
     "message_loop/message_pump_android.cc",
     "message_loop/message_pump_android.h",
@@ skipping 1225 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" ]
   }
 }