Implement net in GN build.

build/config/BUILDCONFIG.gn

 # Copyright (c) 2013 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.
 
 # =============================================================================
 # BUILD FLAGS
 # =============================================================================
 #
 # This block lists input arguments to the build, along with their default
 # values. GN requires listing them explicitly so it can validate input and have
@@ skipping 189 matching lines @@
 # muct match the pattern (so you need "*.cc" to match all .cc files, for
 # example).
 
 # DO NOT ADD MORE PATTERNS TO THIS LIST, see set_sources_assignment_filter call
 # below.
 windows_sources_filters = [
   "*_win.cc",
   "*_win.h",
   "*_win_unittest.cc",
   "*\bwin/*",
+  "*.rc",
 ]
 mac_sources_filters = [
   "*_mac.h",
   "*_mac.cc",
   "*_mac.mm",
   "*_mac_unittest.h",
   "*_mac_unittest.cc",
   "*_mac_unittest.mm",
   "*\bmac/*",
   "*_cocoa.h",
@@ skipping 30 matching lines @@
   "*_android_unittest.cc",
   "*\bandroid/*",
 ]
 posix_sources_filters = [
   "*_posix.h",
   "*_posix.cc",
   "*_posix_unittest.h",
   "*_posix_unittest.cc",
   "*\bposix/*",
 ]
+chromeos_sources_filters = [
+  "*_chromeos.h",
+  "*_chromeos.cc",
+  "*_chromeos_unittest.h",
+  "*_chromeos_unittest.cc",
+  "*\bchromeos/*",
+]
 # DO NOT ADD MORE PATTERNS TO THIS LIST, see set_sources_assignment_filter call
 # below.
 
 # Construct the full list of sources we're using for this platform.
 sources_assignment_filter = []
 if (is_win) {
   sources_assignment_filter += posix_sources_filters
 } else {
   sources_assignment_filter += windows_sources_filters
 }
 if (!is_mac) {
   sources_assignment_filter += mac_sources_filters
 }
 if (!is_ios) {
   sources_assignment_filter += ios_sources_filters
 }
 if (!is_mac && !is_ios) {
   sources_assignment_filter += objective_c_sources_filters
 }
 if (!is_linux) {
   sources_assignment_filter += linux_sources_filters
 }
 if (!is_android) {
   sources_assignment_filter += android_sources_filters
 }
+if (!is_chromeos) {
+  sources_assignment_filter += chromeos_sources_filters
+}
 
 # Actually save this list.
 #
 # DO NOT ADD MORE PATTERNS TO THIS LIST.
 #
 # These patterns are executed for every file in the source tree of every run.
 # Therefore, adding more patterns slows down the build for everybody. We should
 # only add automatic patterns for configurations affecting hundreds of files
 # across many projects in the tree.
 #
@@ skipping 165 matching lines @@
 } else if (is_linux) {
   host_toolchain = "//build/toolchain/linux:$build_cpu_arch"
   set_default_toolchain("//build/toolchain/linux:$cpu_arch")
 } else if (is_mac) {
   host_toolchain = "//build/toolchain/mac:clang"
   set_default_toolchain(host_toolchain)
 } else if (is_ios) {
   host_toolchain = "//build/toolchain/mac:host_clang"
   set_default_toolchain("//build/toolchain/mac:clang")
 }