Motown: New wrapper classes for ffmpeg format context and io context

services/media/framework_ffmpeg/BUILD.gn

 # Copyright 2016 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/module_args/mojo.gni")
 import("$mojo_sdk_root/mojo/public/mojo_sdk.gni")
 
 config("default_include_dirs") {
   include_dirs = [
     "//",
     root_gen_dir,
     "//third_party/ffmpeg",
   ]
 
   # TODO(dalesat): Why is this needed?
   if (is_android) {
     include_dirs +=
         [ "//third_party/ffmpeg/chromium/config/Chromium/android/arm" ]
   }
 }
 
 source_set("framework_ffmpeg") {
   sources = [
+    "av_codec_context.cc",
+    "av_codec_context.h",
+    "av_format_context.h",
+    "av_io_context.cc",
+    "av_io_context.h",
     "ffmpeg_audio_decoder.cc",
     "ffmpeg_audio_decoder.h",
     "ffmpeg_decoder.cc",
     "ffmpeg_decoder.h",
     "ffmpeg_decoder_base.cc",
     "ffmpeg_decoder_base.h",
     "ffmpeg_demux.cc",
     "ffmpeg_demux.h",
     "ffmpeg_formatting.cc",
     "ffmpeg_formatting.h",
     "ffmpeg_init.cc",
     "ffmpeg_init.h",
-    "ffmpeg_io.cc",
-    "ffmpeg_io.h",
-    "ffmpeg_type_converters.cc",
-    "ffmpeg_type_converters.h",
     "ffmpeg_video_decoder.cc",
     "ffmpeg_video_decoder.h",
   ]
 
   deps = [
     "//base",
     "//mojo/common",
     "//services/media/framework",
     "//third_party/ffmpeg",
   ]
 
   defines = [
     "FF_API_PIX_FMT_DESC=0",
     "FF_API_OLD_DECODE_AUDIO=0",
     "FF_API_DESTRUCT_PACKET=0",
     "FF_API_GET_BUFFER=0",
   ]
 
   configs -= [ "//build/config/compiler:default_include_dirs" ]
   configs += [ ":default_include_dirs" ]
 }