Add fnl build target

build/config/BUILDCONFIG.gn

Index: build/config/BUILDCONFIG.gn
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index 10d9d3fb189ed8f756ac51f13813eaa4807ed887..16495470cae54d88b9d9edb535819431627d00dc 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -156,6 +156,7 @@ declare_args() {
 if (current_os == "win") {
   is_android = false
   is_chromeos = false
+  is_fnl = false
   is_ios = false
   is_linux = false
   is_mac = false
@@ -165,6 +166,7 @@ if (current_os == "win") {
 } else if (current_os == "mac") {
   is_android = false
   is_chromeos = false
+  is_fnl = false
   is_ios = false
   is_linux = false
   is_mac = true
@@ -174,6 +176,7 @@ if (current_os == "win") {
 } else if (current_os == "android") {
   is_android = true
   is_chromeos = false
+  is_fnl = false
   is_ios = false
   is_linux = false
   is_mac = false
@@ -183,6 +186,7 @@ if (current_os == "win") {
 } else if (current_os == "chromeos") {
   is_android = false
   is_chromeos = true
+  is_fnl = false
   is_ios = false
   is_linux = true
   is_mac = false
@@ -195,6 +199,7 @@ if (current_os == "win") {
   # Posix variant.
   is_android = false
   is_chromeos = false
+  is_fnl = false
   is_ios = false
   is_linux = false
   is_mac = false
@@ -204,6 +209,7 @@ if (current_os == "win") {
 } else if (current_os == "ios") {
   is_android = false
   is_chromeos = false
+  is_fnl = false
   is_ios = true
   is_linux = false
   is_mac = false
@@ -213,6 +219,17 @@ if (current_os == "win") {
 } else if (current_os == "linux") {
   is_android = false
   is_chromeos = false
+  is_fnl = false
+  is_ios = false
+  is_linux = true
+  is_mac = false
+  is_nacl = false
+  is_posix = true
+  is_win = false
+} else if (current_os == "fnl") {
+  is_android = false
+  is_chromeos = false
+  is_fnl = true
   is_ios = false
   is_linux = true
   is_mac = false
@@ -380,7 +397,9 @@ if (is_posix) {
   ]
 }
 
-if (is_linux) {
+if (is_fnl) {
+  _native_compiler_configs += [ "//build/config/fnl:sdk" ]
+} else if (is_linux) {
   _native_compiler_configs += [ "//build/config/linux:sdk" ]
 } else if (is_mac) {
   _native_compiler_configs += [ "//build/config/mac:sdk" ]
@@ -554,6 +573,9 @@ if (is_win) {
   if (is_chromeos && cros_use_custom_toolchain) {
     set_default_toolchain("//build/toolchain/cros:target")
   }
+  if (is_fnl) {
+    set_default_toolchain("//build/toolchain/fnl:target")
+  }
 } else if (is_mac) {
   host_toolchain = "//build/toolchain/mac:clang_x64"
   set_default_toolchain(host_toolchain)