[Mojo Video Capture] Move conversions between mojom and media types to a separate file

services/video_capture/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("//services/shell/public/cpp/service.gni")
 import("//services/shell/public/service_manifest.gni")
 import("//testing/test.gni")
 
 service("video_capture") {
   sources = [
@@ skipping 21 matching lines @@
 }
 
 source_set("lib") {
   sources = [
     "device_client_media_to_mojo_adapter.cc",
     "device_client_media_to_mojo_adapter.h",
     "device_client_mojo_to_media_adapter.cc",
     "device_client_mojo_to_media_adapter.h",
     "device_mock_to_media_adapter.cc",
     "device_mock_to_media_adapter.h",
+    "mojo_media_conversions.cc",
+    "mojo_media_conversions.h",
     "video_capture_device_factory_impl.cc",
     "video_capture_device_factory_impl.h",
     "video_capture_device_proxy_impl.cc",
     "video_capture_device_proxy_impl.h",
   ]
 
   deps = [
     "//base",
     "//media/capture:capture",
     "//media/mojo/common:common",
@@ skipping 42 matching lines @@
 
   data_deps = [
     ":unittest_manifest",
   ]
 }
 
 service_manifest("unittest_manifest") {
   name = "video_capture_unittests"
   source = "service_unittest_manifest.json"
 }