Move Pipeline permanent callbacks into Pipeline::Client interface.

media/base/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("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
@@ skipping 140 matching lines @@
     "mime_util_internal.h",
     "moving_average.cc",
     "moving_average.h",
     "multi_channel_resampler.cc",
     "multi_channel_resampler.h",
     "null_video_sink.cc",
     "null_video_sink.h",
     "output_device_info.cc",
     "output_device_info.h",
     "pipeline.h",
+    "pipeline_client.h",
     "pipeline_impl.cc",
     "pipeline_impl.h",
     "pipeline_status.h",
     "player_tracker.cc",
     "player_tracker.h",
     "ranges.cc",
     "ranges.h",
     "renderer.cc",
     "renderer.h",
     "renderer_factory.cc",
@@ skipping 405 matching lines @@
 
 fuzzer_test("media_container_names_fuzzer") {
   sources = [
     "container_names_fuzzertest.cc",
   ]
   deps = [
     "//base",
     "//media",
   ]
 }