Add option cc_wrapper to GN

build/toolchain/ccache.gni

-# Copyright (c) 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.
-
-# Defines the configuration of ccache - a c/c++ compiler cache which can
-# greatly reduce recompilation times.
-#
-# TIPS:
-#
-# Set clang_use_chrome_plugins=false if using ccache 3.1.9 or earlier, since
-# these versions don't support -Xclang.  (3.1.10 and later will silently
-# ignore -Xclang, so it doesn't matter if you disable clang_use_chrome_plugins
-# or not).
-#
-# Use ccache 3.2 or later to avoid clang unused argument warnings:
-# https://bugzilla.samba.org/show_bug.cgi?id=8118
-#
-# To avoid -Wparentheses-equality clang warnings, at some cost in terms of
-# speed, you can do:
-# export CCACHE_CPP2=yes
-
-declare_args() {
-  # Set to true to enable ccache.  Probably doesn't work on windows.
-  use_ccache = false
-}