mediaview: Implement ArcDocumentsProviderBackendDelegate.

chrome/browser/chromeos/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/features.gni")
 import("//build/config/ui.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//printing/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 231 matching lines @@
     "arc/fileapi/arc_content_file_system_service.cc",
     "arc/fileapi/arc_content_file_system_service.h",
     "arc/fileapi/arc_content_file_system_url_util.cc",
     "arc/fileapi/arc_content_file_system_url_util.h",
     "arc/fileapi/arc_documents_provider_async_file_util.cc",
     "arc/fileapi/arc_documents_provider_async_file_util.h",
     "arc/fileapi/arc_documents_provider_backend_delegate.cc",
     "arc/fileapi/arc_documents_provider_backend_delegate.h",
     "arc/fileapi/arc_documents_provider_document.cc",
     "arc/fileapi/arc_documents_provider_document.h",
+    "arc/fileapi/arc_documents_provider_file_stream_reader.cc",
+    "arc/fileapi/arc_documents_provider_file_stream_reader.h",
     "arc/fileapi/arc_documents_provider_root.cc",
     "arc/fileapi/arc_documents_provider_root.h",
     "arc/fileapi/arc_documents_provider_root_map.cc",
     "arc/fileapi/arc_documents_provider_root_map.h",
     "arc/fileapi/arc_documents_provider_util.cc",
     "arc/fileapi/arc_documents_provider_util.h",
     "arc/fileapi/arc_file_system_instance_util.cc",
     "arc/fileapi/arc_file_system_instance_util.h",
     "arc/intent_helper/arc_external_protocol_dialog.cc",
     "arc/intent_helper/arc_external_protocol_dialog.h",
@@ skipping 1426 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }