Improve process launch handle sharing API.

content/public/browser/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/ui.gni")
 
 # See //content/BUILD.gn for how this works.
 group("browser") {
   if (is_component_build) {
     public_deps = [
@@ skipping 95 matching lines @@
     "download_item.h",
     "download_manager.h",
     "download_manager_delegate.cc",
     "download_manager_delegate.h",
     "download_save_info.cc",
     "download_save_info.h",
     "download_url_parameters.cc",
     "download_url_parameters.h",
     "favicon_status.cc",
     "favicon_status.h",
-    "file_descriptor_info.h",
     "focused_node_details.h",
     "font_list_async.h",
     "global_request_id.h",
     "gpu_data_manager.h",
     "gpu_data_manager_observer.h",
     "gpu_feature_checker.cc",
     "gpu_feature_checker.h",
     "gpu_service_registry.cc",
     "gpu_service_registry.h",
     "gpu_utils.cc",
@@ skipping 201 matching lines @@
     "//ui/gl",
     "//ui/surface",
   ]
 
   allow_circular_includes_from = [
     # This target is a pair with content/browser. They always go together and
     # include headers from each other.
     "//content/browser",
   ]
 
+  if (is_posix) {
+    sources += [ "posix_file_descriptor_info.h" ]
+  }
+
   if (is_android) {
     deps += [ "//ui/android" ]
   }
 
   if (use_aura) {
     sources -= [ "context_factory.h" ]
     deps += [ "//ui/aura" ]
   }
 
   if (!is_android) {
     sources += [
       "devtools_frontend_host.h",
       "host_zoom_map.h",
       "zoom_level_delegate.h",
     ]
   }
 
   if (is_chromeos) {
     sources += [
       "arc_tracing_agent.cc",
       "arc_tracing_agent.h",
     ]
   }
 }