Config changes to support target_os="fuchsia"

build/config/compiler/compiler.gni

 # Copyright 2015 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/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/pgo/pgo.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/goma.gni")
@@ skipping 57 matching lines @@
   # default for the PGO and the x64 builds.
   if (chrome_pgo_phase > 0) {
     full_wpo_on_official = true
   } else {
     full_wpo_on_official = false
   }
 }
 
 declare_args() {
   # Whether to use the gold linker from binutils instead of lld or bfd.
-  use_gold = !use_lld && !(is_chromecast && is_linux &&
-                           (current_cpu == "arm" || current_cpu == "mipsel")) &&
-             ((is_linux && (current_cpu == "x64" || current_cpu == "x86" ||
-                            current_cpu == "arm" || current_cpu == "mipsel")) ||
-              (is_android && (current_cpu == "x86" || current_cpu == "x64" ||
-                              current_cpu == "arm" || current_cpu == "arm64")))
+  use_gold =
+      !use_lld && !(is_chromecast && is_linux &&
+                    (current_cpu == "arm" || current_cpu == "mipsel")) &&
+      ((is_linux && (current_cpu == "x64" || current_cpu == "x86" ||
+                     current_cpu == "arm" || current_cpu == "mipsel")) ||
+       (is_android && (current_cpu == "x86" || current_cpu == "x64" ||
+                       current_cpu == "arm" || current_cpu == "arm64")) ||
+       is_fuchsia)
 }
 
 # If it wasn't manually set, set to an appropriate default.
 assert(symbol_level >= -1 && symbol_level <= 2, "Invalid symbol_level")
 if (symbol_level == -1) {
   if (is_android && use_order_profiling) {
     # With instrumentation enabled, debug info puts libchrome.so over 4gb, which
     # causes the linker to produce an invalid ELF. http://crbug.com/574476
     symbol_level = 0
   } else if (is_android && !is_component_build &&
@@ skipping 31 matching lines @@
 }
 
 # Assert that the configuration isn't going to hit https://crbug.com/648948.
 assert(ignore_elf32_limitations || !is_android ||
            (android_64bit_target_cpu && !build_apk_secondary_abi) ||
            is_component_build || symbol_level < 2,
        "Android 32-bit non-component builds cannot have symbol_level=2 " +
            "due to 4GiB file size limit, see https://crbug.com/648948. " +
            "If you really want to try this out, " +
            "set ignore_elf32_limitations=true.")