Win10 Tests x64 (debug): Fix tests

Forces layout tests to run in a debug mode.

Bug: 818832
Change-Id: I860e41169ea759e32806ba4ab45ca4e0d72ba4cd
Reviewed-on: https://chromium-review.googlesource.com/1014634
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: Stephen Martinis <[email protected]>
Cr-Commit-Position: refs/heads/master@{#551230}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 827e7a50..6acf2a1 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -3644,6 +3644,11 @@
           ],
         },
       },
+      'Win10 Tests x64 (dbg)': {
+        'args': [
+          '--debug',
+        ],
+      },
     },
   },
   'webkit_unit_tests': {