Change sampler code events phase from instant to meta.

base/trace_event/trace_event_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <cstdlib>
 
@@ skipping 1233 matching lines @@
 
    private:
     ~Convertable() override {}
     int* num_calls_;
   };
 
   scoped_refptr<ConvertableToTraceFormat> convertable =
       new Convertable(&num_calls);
 
   BeginTrace();
-  TRACE_EVENT_API_ADD_METADATA_EVENT("metadata_event_name", "metadata_arg_name",
-                                     convertable);
+  TRACE_EVENT_API_ADD_METADATA_EVENT(
+      TraceLog::GetCategoryGroupEnabled("__metadata"), "metadata_event_name",
+      "metadata_arg_name", convertable);
 
   // |AppendAsTraceFormat| should only be called on flush, not when the event
   // is added.
   ASSERT_EQ(0, num_calls);
   EndTraceAndFlush();
   ASSERT_EQ(1, num_calls);
   EXPECT_TRUE(FindNamePhaseKeyValue("metadata_event_name", "M",
                                     "metadata_arg_name", "metadata_value"));
 
   // The metadata event should only be adde to the current trace. In this new
@@ skipping 1800 matching lines @@
 }
 
 TEST_F(TraceEventTestFixture, SyntheticDelayConfigurationToString) {
   const char filter[] = "DELAY(test.Delay;16;oneshot)";
   TraceConfig config(filter, "");
   EXPECT_EQ(filter, config.ToCategoryFilterString());
 }
 
 }  // namespace trace_event
 }  // namespace base