Log operator code histogram on new metric log

chrome/browser/metrics/metrics_service_observer.cc

Index: chrome/browser/metrics/metrics_service_observer.cc
diff --git a/tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp b/chrome/browser/metrics/metrics_service_observer.cc
similarity index 50%
copy from tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp
copy to chrome/browser/metrics/metrics_service_observer.cc
index 8fe7b955f3154aea864b2c3c1295374338554393..754c10f14289bc6e2cb23582fca19a1b5c4c91a0 100644
--- a/tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp
+++ b/chrome/browser/metrics/metrics_service_observer.cc
@@ -2,16 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "cycle_ptrs.h"
+#include "chrome/browser/chrome_browser_metrics_service_observer.h"
 
-namespace WebCore {
-
-void A::trace(Visitor* visitor) {
-    visitor->trace(m_b);
-}
-
-void B::trace(Visitor* visitor) {
-    visitor->trace(m_a);
+MetricsServiceObserver::MetricsServiceObserver() {
 }
 
+MetricsServiceObserver::~MetricsServiceObserver() {
 }