[flow_control] Enable experiment in debug builds (#31693)

bazel/experiments.bzl

@@ -24,6 +24,9 @@ EXPERIMENTS = {
         "event_engine_client_test": [
             "posix_event_engine_enable_polling",
         ],
+        "flow_control_test": [
+            "flow_control_fixes",
+        ],
         "hpack_test": [
             "new_hpack_huffman_decoder",
         ],
@@ -40,7 +43,6 @@ EXPERIMENTS = {
             "event_engine_client",
         ],
         "flow_control_test": [
-            "flow_control_fixes",
             "peer_state_based_framing",
             "tcp_frame_size_tuning",
             "tcp_rcv_lowat",

src/core/lib/experiments/experiments.cc

@@ -65,7 +65,8 @@ const ExperimentMetadata g_experiment_metadata[] = {
     {"tcp_read_chunks", description_tcp_read_chunks, true},
     {"tcp_rcv_lowat", description_tcp_rcv_lowat, false},
     {"peer_state_based_framing", description_peer_state_based_framing, false},
-    {"flow_control_fixes", description_flow_control_fixes, false},
+    {"flow_control_fixes", description_flow_control_fixes,
+     kDefaultForDebugOnly},
     {"memory_pressure_controller", description_memory_pressure_controller,
      false},
     {"unconstrained_max_quota_buffer_size",

src/core/lib/experiments/experiments.yaml

@@ -73,7 +73,7 @@
 - name: flow_control_fixes
   description:
     Various fixes for flow control, max frame size setting.
-  default: false
+  default: debug
   expiry: 2023/01/01
   owner: ctiller@google.com
   test_tags: ["flow_control_test"]