045.patch

--- a/base/metrics/user_metrics.cc	2017-10-04 18:07:32.000000000 -0400
+++ b/base/metrics/user_metrics.cc	2017-10-08 20:14:31.035566604 -0400
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/bind.h"
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "base/macros.h"
@@ -23,12 +24,21 @@
     g_task_runner = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
+static bool MetricsEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch("enable-metrics");
+}
 
 void RecordAction(const UserMetricsAction& action) {
+  if (!enabled())
+    return;
+
   RecordComputedAction(action.str_);
 }
 
 void RecordComputedAction(const std::string& action) {
+  if (!enabled())
+    return;
+
   if (!g_task_runner.Get()) {
     DCHECK(g_callbacks.Get().empty());
     return;
@@ -46,6 +56,9 @@
 }
 
 void AddActionCallback(const ActionCallback& callback) {
+  if (!enabled())
+    return;
+
   // Only allow adding a callback if the task runner is set.
   DCHECK(g_task_runner.Get());
   DCHECK(g_task_runner.Get()->BelongsToCurrentThread());