Disable angle_end2end_tests on Win/old AMD.

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 32929e89feb958bca15366ef1724e12454ba9f03..4aecd549e711cc6a479b76c81a7efbe43989a1ff 100755
--- a/content/test/gpu/generate_buildbot_json.py
+++ b/content/test/gpu/generate_buildbot_json.py
@@ -983,6 +983,10 @@ COMMON_GTESTS = {
           'Android Release (Nexus 5)',
           'Android Release (Nexus 6)',
           'Android Release (Nexus 9)',
+
+          # These tests are flaky on old AMD.
+          # TODO(jmadill): Enably flaky test retries only on this config.
+          'Win7 Release (AMD R5 230)',
         ],
       },
     ],