Reviewer feedback: friend func not clasS

src/core/lib/debug/trace.h

@@ -58,8 +58,12 @@ class TraceFlagList {
   TraceFlag* root_tracer_;
 };
 
+namespace testing {
+void grpc_tracer_peer_enable_flag(grpc_core::TraceFlag* flag);
+}
+
 class TraceFlag {
-  friend class TraceFlagPeer;
+  friend void grpc_core::testing::grpc_tracer_peer_enable_flag(TraceFlag* flag);
   friend class TraceFlagList;
 
  public:

test/core/iomgr/timer_list_test.cc

@@ -49,8 +49,8 @@ static void add_test(void) {
   gpr_log(GPR_INFO, "add_test");
 
   grpc_timer_list_init(&exec_ctx);
-  grpc_tracer_peer_enable_flag(&grpc_timer_trace);
-  grpc_tracer_peer_enable_flag(&grpc_timer_check_trace);
+  grpc_core::testing::grpc_tracer_peer_enable_flag(&grpc_timer_trace);
+  grpc_core::testing::grpc_tracer_peer_enable_flag(&grpc_timer_check_trace);
   memset(cb_called, 0, sizeof(cb_called));
 
   grpc_millis start = grpc_exec_ctx_now(&exec_ctx);
@@ -118,8 +118,8 @@ void destruction_test(void) {
   exec_ctx.now_is_valid = true;
   exec_ctx.now = 0;
   grpc_timer_list_init(&exec_ctx);
-  grpc_tracer_peer_enable_flag(&grpc_timer_trace);
-  grpc_tracer_peer_enable_flag(&grpc_timer_check_trace);
+  grpc_core::testing::grpc_tracer_peer_enable_flag(&grpc_timer_trace);
+  grpc_core::testing::grpc_tracer_peer_enable_flag(&grpc_timer_check_trace);
   memset(cb_called, 0, sizeof(cb_called));
 
   grpc_timer_init(

test/core/transport/connectivity_state_test.cc

@@ -137,7 +137,8 @@ static void test_subscribe_with_failure_then_destroy(void) {
 
 int main(int argc, char** argv) {
   grpc_test_init(argc, argv);
-  grpc_tracer_peer_enable_flag(&grpc_connectivity_state_trace);
+  grpc_core::testing::grpc_tracer_peer_enable_flag(
+      &grpc_connectivity_state_trace);
   test_connectivity_state_name();
   test_check();
   test_subscribe_then_unsubscribe();

test/core/util/tracer_peer.cc

@@ -21,21 +21,11 @@
 #include "src/core/lib/debug/trace.h"
 
 namespace grpc_core {
-
-// This class is a friend of TraceFlag, and can be used to manually turn on
-// certain tracers for tests.
-class TraceFlagPeer {
- public:
-  TraceFlagPeer(TraceFlag* flag) : flag_(flag) {}
-  void enable() { flag_->set_enabled(1); }
-  void disable() { flag_->set_enabled(0); }
-
- private:
-  TraceFlag* flag_;
-};
-}  // namespace grpc_core
+namespace testing {
 
 void grpc_tracer_peer_enable_flag(grpc_core::TraceFlag* flag) {
-  grpc_core::TraceFlagPeer peer(flag);
-  peer.enable();
+  flag->set_enabled(1);
 }
+
+}  // namespace testing
+}  // namespace grpc_core

test/core/util/tracer_peer.h

@@ -21,9 +21,12 @@
 
 namespace grpc_core {
 class TraceFlag;
-}
 
+namespace testing {
 // enables the TraceFlag passed to it. Used for testing purposes.
 void grpc_tracer_peer_enable_flag(grpc_core::TraceFlag* flag);
 
+}  // namespace testing
+}  // namespace grpc_core
+
 #endif /* GRPC_TEST_CORE_UTIL_TRACER_PEER_H */