Run gyp_flag_compare.py on Linux GN bots

scripts/slave/recipes/chromium_gn.py

Index: scripts/slave/recipes/chromium_gn.py
diff --git a/scripts/slave/recipes/chromium_gn.py b/scripts/slave/recipes/chromium_gn.py
index 120da6f356dd2df22c8cc2eee0ce8008c0e82e60..430639e28c5e64cd99a2848ebb34afea86625887 100644
--- a/scripts/slave/recipes/chromium_gn.py
+++ b/scripts/slave/recipes/chromium_gn.py
@@ -73,12 +73,14 @@ BUILDERS = {
         'chromium_config_kwargs': {
           'BUILD_CONFIG': 'Release',
         },
+        'should_run_gn_gyp_compare': True,
       },
       'Linux GN (dbg)': {
         'chromium_config_kwargs': {
           'BUILD_CONFIG': 'Debug',
         },
         'chromium_apply_config': ['gn_component_build'],
+        'should_run_gn_gyp_compare': True,
       },
     },
   },
@@ -193,6 +195,9 @@ def GenSteps(api):
 
   api.chromium.compile(targets=['all'])
 
+  if bot_config.get('should_run_gn_gyp_compare', False):
+    api.chromium.run_gn_compare()
+
   # TODO(dpranke): crbug.com/353854. Run gn_unittests and other tests
   # when they are also being run as part of the try jobs.