Use SKIA_OUT variable in make.py

make.py

 # Copyright 2011 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # "Makefile" replacement to build skia for Windows.
 # More info at https://sites.google.com/site/skiadocs/
 #
 # Some usage examples:
 #   make clean
 #   make tests
 #   make bench BUILDTYPE=Release
 #   make gm GYP_DEFINES=skia_scalar=fixed BUILDTYPE=Release
 #   make all
 
 import os
 import shutil
 import sys
 
 BUILDTYPE = 'Debug'
 
 # special targets
 TARGET_ALL     = 'all'
 TARGET_CLEAN   = 'clean'
 TARGET_DEFAULT = 'most'
 TARGET_GYP     = 'gyp'
 
 SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))
-OUT_SUBDIR = 'out'
+OUT_SUBDIR = os.environ.get('SKIA_OUT', 'out')
 GYP_SUBDIR = 'gyp'
 
 
 # Simple functions that report what they are doing, and exit(1) on failure.
 def cd(path):
     print '> cd %s' % path
     if not os.path.isdir(path):
         print 'directory %s does not exist' % path
         sys.exit(1)
     os.chdir(path)
@@ skipping 139 matching lines @@
         print 'unknown platform (os.name=%s, sys.platform=%s); see %s' % (
             os.name, sys.platform, 'https://sites.google.com/site/skiadocs/')
         sys.exit(1)
     sys.exit(0)
 
 
 # main()
 Make(sys.argv[1:])