gyp performance: don't invoke python to check dir existance

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1279 matching lines @@
     'android_full_debug%': 0,
 
     # Sets the default version name and code for Android app, by default we
     # do a developer build.
     'android_app_version_name%': 'Developer Build',
     'android_app_version_code%': 0,
 
     # Contains data about the attached devices for gyp_managed_install.
     'build_device_config_path': '<(PRODUCT_DIR)/build_devices.cfg',
 
-    'sas_dll_exists': '<!(python <(DEPTH)/build/dir_exists.py "<(sas_dll_path)")',
-    'wix_exists': '<!(python <(DEPTH)/build/dir_exists.py "<(wix_path)")',
+    'sas_dll_exists': '<!pymod_do_main(dir_exists "<(sas_dll_path)")',
+    'wix_exists': '<!pymod_do_main(dir_exists "<(wix_path)")',
 
     'windows_sdk_default_path': '<(DEPTH)/third_party/platformsdk_win8/files',
     'directx_sdk_default_path': '<(DEPTH)/third_party/directxsdk/files',
 
     # Whether we are using the rlz library or not.  Platforms like Android send
     # rlz codes for searches but do not use the library.
     'enable_rlz%': 0,
 
     # Turns on the i18n support in V8.
     'v8_enable_i18n_support': 1,
@@ skipping 53 matching lines @@
             'binutils_version%': 222,
           }, {
             'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
             'binutils_version%': '<!(python <(DEPTH)/build/compiler_version.py assembler)',
           }],
         ],
       }, {
         'gcc_version%': 0,
         'binutils_version%': 0,
       }],
-      ['OS=="win" and "<!(python <(DEPTH)/build/dir_exists.py <(windows_sdk_default_path))"=="True"', {
+      ['OS=="win" and "<!pymod_do_main(dir_exists <(windows_sdk_default_path))"=="True"', {
         'windows_sdk_path%': '<(windows_sdk_default_path)',
       }, {
         'windows_sdk_path%': 'C:/Program Files (x86)/Windows Kits/8.0',
       }],
-      ['OS=="win" and "<!(python <(DEPTH)/build/dir_exists.py <(directx_sdk_default_path))"=="True"', {
+      ['OS=="win" and "<!pymod_do_main(dir_exists <(directx_sdk_default_path))"=="True"', {
         'directx_sdk_path%': '<(directx_sdk_default_path)',
       }, {
         'directx_sdk_path%': '$(DXSDK_DIR)',
       }],
       ['OS=="win"', {
         'windows_driver_kit_path%': '$(WDK_DIR)',
       }],
       ['os_posix==1 and OS!="mac" and OS!="ios"', {
         'conditions': [
           ['target_arch=="mipsel"', {
@@ skipping 3819 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }