Let CrWinClang64(dbg) use gn.

scripts/slave/recipe_modules/chromium/chromium_fyi.py

 # Copyright 2014 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.
 
 from . import steps
 
 RESULTS_URL = 'https://chromeperf.appspot.com'
 
 SPEC = {
   'settings': {
@@ skipping 524 matching lines @@
       ],
       'bot_type': 'tester',
       'parent_buildername': 'CrWinClang64',
       'testing': {
         'platform': 'win',
       },
       'enable_swarming': True,
     },
     'CrWinClang64(dbg)': {
       'chromium_config': 'chromium_win_clang',
+      'chromium_apply_config': ['mb'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Debug',
         'TARGET_BITS': 64,
       },
       # Recipes builds Debug builds with component=shared_library by default.
       'bot_type': 'builder',
       'testing': {
         'platform': 'win',
       },
-      'use_isolate': True,
-      'enable_swarming': True,
+      # TODO(thakis): Reenable when swarming works in gn http://crbug.com/480053
+      #'use_isolate': True,
+      #'enable_swarming': True,

[Nico, 2015/06/09 05:09:36]

I guess I didn't have to change the json file in
https://codereview.chromium.org/1170063002/

[Dirk Pranke, 2015/06/09 15:50:01]

Yeah, but probably better to be clearer anyway.

       # Workaround so that recipes doesn't add random build targets to our
       # compile line. We want to build everything.
       'add_tests_as_compile_targets': False,
     },
     'CrWinClang64(dbg) tester': {
       'chromium_config': 'chromium_no_goma',
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Debug',
         'TARGET_BITS': 64,
       },
       'test_generators': [
         steps.generate_gtest,
       ],
       'bot_type': 'tester',
       'parent_buildername': 'CrWinClang64(dbg)',
       'testing': {
         'platform': 'win',
       },
-      'enable_swarming': True,
+      # TODO(thakis): Reenable when swarming works in gn http://crbug.com/480053
+      #'enable_swarming': True,
     },
     'CrWinClang64(dll)': {
       'chromium_config': 'chromium_win_clang',
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
         'TARGET_BITS': 64,
       },
       'GYP_DEFINES': { 'component': 'shared_library' },
       'bot_type': 'builder',
@@ skipping 895 matching lines @@
             'ChromotingTest', 'remoting_test_apk',
             adb_install_apk=(
               'Chromoting.apk', 'org.chromium.chromoting')),
       ],
       'testing': {
         'platform': 'linux',
       },
     },
   },
 }