Let CrWinClang64(dbg) use gn.

scripts/slave/recipe_modules/chromium/chromium_fyi.py

Index: scripts/slave/recipe_modules/chromium/chromium_fyi.py
===================================================================
--- scripts/slave/recipe_modules/chromium/chromium_fyi.py	(revision 295571)
+++ scripts/slave/recipe_modules/chromium/chromium_fyi.py	(working copy)
@@ -542,6 +542,7 @@
     },
     'CrWinClang64(dbg)': {
       'chromium_config': 'chromium_win_clang',
+      'chromium_apply_config': ['mb'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Debug',
@@ -552,8 +553,9 @@
       '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,
@@ -573,7 +575,8 @@
       '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',