[Extensions] Add extension feature generation code

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 325 matching lines @@
       '../third_party/zlib/google/zip_reader_unittest.cc',
       '../third_party/zlib/google/zip_unittest.cc',
       '../tools/json_schema_compiler/test/additional_properties_unittest.cc',
       '../tools/json_schema_compiler/test/any_unittest.cc',
       '../tools/json_schema_compiler/test/arrays_unittest.cc',
       '../tools/json_schema_compiler/test/callbacks_unittest.cc',
       '../tools/json_schema_compiler/test/choices_unittest.cc',
       '../tools/json_schema_compiler/test/crossref_unittest.cc',
       '../tools/json_schema_compiler/test/enums_unittest.cc',
       '../tools/json_schema_compiler/test/error_generation_unittest.cc',
+      '../tools/json_schema_compiler/test/features_generation_unittest.cc',
       '../tools/json_schema_compiler/test/functions_as_parameters_unittest.cc',
       '../tools/json_schema_compiler/test/functions_on_types_unittest.cc',
       '../tools/json_schema_compiler/test/idl_schemas_unittest.cc',
       '../tools/json_schema_compiler/test/objects_unittest.cc',
       '../tools/json_schema_compiler/test/simple_api_unittest.cc',
     ],
     'chrome_unit_tests_android_sources': [
       'browser/autofill/autofill_save_card_infobar_delegate_mobile_unittest.cc',
       'browser/password_manager/account_chooser_dialog_android_unittest.cc',
       'browser/password_manager/auto_signin_first_run_dialog_android_unittest.cc',
@@ skipping 1947 matching lines @@
             '../device/bluetooth/bluetooth.gyp:device_bluetooth_mocks',
             '../device/usb/usb.gyp:device_usb_mocks',
             '../gpu/gpu.gyp:gpu_unittest_utils',
             '../media/media.gyp:media_test_support',
             '../ppapi/ppapi_internal.gyp:ppapi_unittest_shared',
             '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
             '../third_party/libaddressinput/libaddressinput.gyp:libaddressinput',
             '../third_party/libphonenumber/libphonenumber.gyp:libphonenumber',
             '../third_party/webrtc/modules/modules.gyp:desktop_capture',
             '../tools/json_schema_compiler/test/json_schema_compiler_tests.gyp:json_schema_compiler_tests',
+            '../tools/json_schema_compiler/test/json_schema_compiler_tests.gyp:feature_compiler_tests',
             '../ui/gl/gl.gyp:gl',
             '../ui/gl/gl.gyp:gl_test_support',
           ],
           'include_dirs': [
             '<(SHARED_INTERMEDIATE_DIR)/chrome',
           ],
         }, {  # OS=="ios"
           'dependencies': [
             '../third_party/ocmock/ocmock.gyp:ocmock',
           ],
@@ skipping 699 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }