Move VideoDecoder::Create() logic to separate internal video decoder factory

webrtc/media/BUILD.gn

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/linux/pkg_config.gni")
 import("../build/webrtc.gni")
@@ skipping 63 matching lines @@
     "base/videobroadcaster.cc",
     "base/videobroadcaster.h",
     "base/videocapturer.cc",
     "base/videocapturer.h",
     "base/videocapturerfactory.h",
     "base/videocommon.cc",
     "base/videocommon.h",
     "base/videoframe.h",
     "base/videosourcebase.cc",
     "base/videosourcebase.h",
+    "engine/internaldecoderfactory.cc",
+    "engine/internaldecoderfactory.h",
     "engine/internalencoderfactory.cc",
     "engine/internalencoderfactory.h",
     "engine/nullwebrtcvideoengine.h",
     "engine/payload_type_mapper.cc",
     "engine/payload_type_mapper.h",
     "engine/simulcast.cc",
     "engine/simulcast.h",
     "engine/videodecodersoftwarefallbackwrapper.cc",
     "engine/videodecodersoftwarefallbackwrapper.h",
     "engine/videoencodersoftwarefallbackwrapper.cc",
@@ skipping 248 matching lines @@
       # TODO(kjellander): Move as part of work in bugs.webrtc.org/4243.
       ":rtc_media",
       ":rtc_unittest_main",
       "../audio",
       "../base:rtc_base_tests_utils",
       "../modules/audio_device:mock_audio_device",
       "../system_wrappers:metrics_default",
     ]
   }
 }