Disable all GPU tests on N5X bot temporarily.

content/test/gpu/generate_buildbot_json.py

Index: content/test/gpu/generate_buildbot_json.py
diff --git a/content/test/gpu/generate_buildbot_json.py b/content/test/gpu/generate_buildbot_json.py
index 83259fcecd3e16dce81755381051b63abb994f16..1ae945bece0cb4bdc3ede97296a9101433056747 100755
--- a/content/test/gpu/generate_buildbot_json.py
+++ b/content/test/gpu/generate_buildbot_json.py
@@ -1432,6 +1432,9 @@ def tester_config_matches_tester(tester_name, tester_config, tc, is_fyi,
   return True
 
 def should_run_on_tester(tester_name, tester_config, test_config, is_fyi):
+  # TODO(jmadill): Re-enable when n5x fixed. See http://crbug.com/672502.
+  if 'Nexus 5X' in tester_name:
+    return False
   # Check if this config is disabled on this tester
   if 'disabled_tester_configs' in test_config:
     for dtc in test_config['disabled_tester_configs']: