[GN/iOS/Mac] Decouple copy_bundle_data from gyp mac_tool.py.

build/toolchain/mac/BUILD.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.
 
 # TODO(brettw) Use "gcc_toolchain.gni" like the Linux toolchains. This requires
 # some enhancements since the commands on Mac are slightly different than on
 # Linux.
 
 import("../goma.gni")
 import("//build/config/ios/ios_sdk.gni")
@@ skipping 221 matching lines @@
     tool("stamp") {
       command = stamp_command
       description = stamp_description
     }
     tool("copy") {
       command = copy_command
       description = copy_description
     }
 
     tool("copy_bundle_data") {
-      if (is_ios) {
-        _convert_to_binary = "True"
-      } else {
-        _convert_to_binary = "False"
-      }
-      command = "rm -rf {{output}} && ./gyp-mac-tool copy-bundle-resource {{source}} {{output}} $_convert_to_binary"
+      _tool = rebase_path("//build/toolchain/mac/copy_bundle_data.py",
+                          root_build_dir)
+      command = "python $_tool {{source}} {{output}}"
       description = "COPY_BUNDLE_DATA {{source}} {{output}}"
     }
     tool("compile_xcassets") {
       if (is_ios) {
         _configuration = "Release"
         if (is_debug) {
           _configuration = "Debug"
         }
 
         _compile_xcassets_env =
@@ skipping 102 matching lines @@
 }
 
 mac_toolchain("x64") {
   toolchain_cpu = "x64"
   toolchain_os = "mac"
   cc = "${goma_prefix}/gcc"
   cxx = "${goma_prefix}/g++"
   ld = cxx
   is_clang = false
 }