[Cast] Refactor ExternalVideoEncoder for cleaner/simpler encapsulation.

media/cast/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("//testing/test.gni")
 
 component("cast") {
   deps = [
     ":sender",
     ":receiver",
@@ skipping 278 matching lines @@
     "net/rtp/rtp_packetizer_unittest.cc",
     "net/rtp/rtp_receiver_defines.h",
     "net/udp_transport_unittest.cc",
     "receiver/audio_decoder_unittest.cc",
     "receiver/frame_receiver_unittest.cc",
     "receiver/video_decoder_unittest.cc",
     "sender/audio_encoder_unittest.cc",
     "sender/audio_sender_unittest.cc",
     "sender/congestion_control_unittest.cc",
     "sender/external_video_encoder_unittest.cc",
+    "sender/fake_video_encode_accelerator_factory.cc",
+    "sender/fake_video_encode_accelerator_factory.h",
     "sender/video_encoder_impl_unittest.cc",
     "sender/video_sender_unittest.cc",
     "test/end2end_unittest.cc",
     "test/fake_receiver_time_offset_estimator.cc",
     "test/fake_receiver_time_offset_estimator.h",
     "test/utility/audio_utility_unittest.cc",
     "test/utility/barcode_unittest.cc",
   ]
 
   deps = [
@@ skipping 56 matching lines @@
   sources = [
     "test/utility/udp_proxy_main.cc",
   ]
 
   deps = [
     ":test_support",
     "//base",
     "//net",
   ]
 }