Fix compile after flowctl merge

src/core/ext/transport/chttp2/transport/chttp2_transport.cc

@@ -91,7 +91,6 @@ static int g_default_max_ping_strikes = DEFAULT_MAX_PING_STRIKES;
 
 #define MAX_CLIENT_STREAM_ID 0x7fffffffu
 grpc_core::TraceFlag grpc_http_trace(false, "http");
-grpc_core::TraceFlag grpc_flowctl_trace(false, "flowctl");
 
 grpc_core::DebugOnlyTraceFlag grpc_trace_chttp2_refcount(false,
                                                          "chttp2_refcount");

src/core/ext/transport/chttp2/transport/chttp2_transport.h

@@ -28,7 +28,6 @@ extern "C" {
 #endif
 
 extern grpc_core::TraceFlag grpc_http_trace;
-extern grpc_core::TraceFlag grpc_flowctl_trace;
 extern grpc_core::TraceFlag grpc_trace_http2_stream_state;
 
 #ifndef NDEBUG

src/core/ext/transport/chttp2/transport/flow_control.cc

@@ -31,6 +31,8 @@
 #include "src/core/ext/transport/chttp2/transport/internal.h"
 #include "src/core/lib/support/string.h"
 
+grpc_core::TraceFlag grpc_flowctl_trace(false, "flowctl");
+
 namespace grpc_core {
 namespace chttp2 {
 

src/core/ext/transport/chttp2/transport/flow_control.h

@@ -30,7 +30,7 @@
 struct grpc_chttp2_transport;
 struct grpc_chttp2_stream;
 
-extern "C" grpc_tracer_flag grpc_flowctl_trace;
+extern grpc_core::TraceFlag grpc_flowctl_trace;
 
 namespace grpc_core {
 namespace chttp2 {
@@ -112,7 +112,7 @@ class FlowControlTrace {
             StreamFlowControl* sfc);
   void Finish();
 
-  const bool enabled_ = GRPC_TRACER_ON(grpc_flowctl_trace);
+  const bool enabled_ = grpc_flowctl_trace.enabled();
 
   TransportFlowControl* tfc_;
   StreamFlowControl* sfc_;

src/core/ext/transport/chttp2/transport/internal.h

@@ -679,7 +679,6 @@ void grpc_chttp2_complete_closure_step(grpc_exec_ctx *exec_ctx,
   (sizeof(GRPC_CHTTP2_CLIENT_CONNECT_STRING) - 1)
 
 extern grpc_core::TraceFlag grpc_http_trace;
-extern grpc_core::TraceFlag grpc_flowctl_trace;
 
 #define GRPC_CHTTP2_IF_TRACING(stmt) \
   if (!grpc_http_trace.enabled())    \

src/core/lib/debug/trace.cc

@@ -29,6 +29,8 @@ int grpc_tracer_set_enabled(const char *name, int enabled);
 
 namespace grpc_core {
 
+TraceFlag* TraceFlag::root_tracer_ = nullptr;
+
 TraceFlag::TraceFlag(bool default_enabled, const char *name)
     : next_tracer_(root_tracer_), name_(name), value_(default_enabled) {
   root_tracer_ = this;

src/core/lib/debug/trace.h

@@ -47,7 +47,7 @@ namespace grpc_core {
 class TraceFlag {
  public:
   TraceFlag(bool default_enabled, const char *name);
-  ~TraceFlag();
+  ~TraceFlag() { }
 
   static bool Set(const char *tracer, bool enabled);