Pass GYP DEPTH variable to isolate.

build/isolate.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.
 
 # This file is meant to be included into a target to provide a rule
 # to "build" .isolate files into a .isolated file.
 #
 # To use this, create a gyp target with the following form:
 # 'conditions': [
 #   ['test_isolation_mode != "noop"', {
@@ skipping 64 matching lines @@
 
         # Variables should use the -V FOO=<(FOO) form so frequent values,
         # like '0' or '1', aren't stripped out by GYP. Run 'isolate.py help' for
         # more details.
         #
         # This list needs to be kept in sync with the cmd line options
         # in src/build/android/pylib/gtest/setup.py.
 
         # Path variables are used to replace file paths when loading a .isolate
         # file
+        '--path-variable', 'DEPTH', '<(DEPTH)',
         '--path-variable', 'PRODUCT_DIR', '<(PRODUCT_DIR) ',
 
         # Extra variables are replaced on the 'command' entry and on paths in
         # the .isolate file but are not considered relative paths.
         '--extra-variable', 'version_full=<(version_full)',
 
         '--config-variable', 'OS=<(OS)',
         '--config-variable', 'chromeos=<(chromeos)',
         '--config-variable', 'component=<(component)',
         # TODO(kbr): move this to chrome_tests.gypi:gles2_conform_tests_run
@@ skipping 16 matching lines @@
         ["test_isolation_outdir!=''", {
           'action': [ '--isolate-server', '<(test_isolation_outdir)' ],
         }],
         ['test_isolation_fail_on_missing == 0', {
           'action': ['--ignore_broken_items'],
         }],
       ],
     },
   ],
 }