Infrastructure for reading V8's initial snapshot from external files

chrome/js_unittest_rules.gypi

 # Copyright (c) 2011 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 defines rules that allow you to include JavaScript tests in
 # your unittests target.
 
 # To add JS unittests to an existing unittest target, first include
 # 'js_unittest_vars.gypi' at the top of your GYP file to define the required
 # variables:
@@ skipping 36 matching lines @@
         'python',
         '<@(_inputs)',
         '<(RULE_INPUT_PATH)',
         '<@(_outputs)',
       ],
     },
     {
       'rule_name': 'js2unit',
       'extension': 'gtestjs',
       'msvs_external_rule': 1,
+      'variables': {
+        'conditions': [
+          ['v8_use_external_startup_data==1', {
+            'external_v8': 'y',
+          }, {
+            'external_v8': 'n',
+          }],
+        ],
+      },
       'inputs': [
         '<(gypv8sh)',
         '<(PRODUCT_DIR)/d8<(EXECUTABLE_SUFFIX)',
         '<(mock_js)',
         '<(test_api_js)',
         '<(js2gtest)',
       ],
       'outputs': [
         '<(INTERMEDIATE_DIR)/chrome/<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT)-gen.cc',
         '<(PRODUCT_DIR)/test_data/chrome/<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).<(_extension)',
       ],
       'process_outputs_as_sources': 1,
       'action': [
         'python',
         '<@(_inputs)',
+        '--external', '<(external_v8)',
         'unit',
         '<(RULE_INPUT_PATH)',
         'chrome/<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).<(_extension)',
         '<@(_outputs)',
       ],
     },
   ],
 }