metrics: Add leak detector controller in Chrome OS metrics system

chrome/browser/metrics/chromeos_metrics_provider.h

Index: chrome/browser/metrics/chromeos_metrics_provider.h
diff --git a/chrome/browser/metrics/chromeos_metrics_provider.h b/chrome/browser/metrics/chromeos_metrics_provider.h
index 6b1c90040b0f554e74354a4eec921792c8d40d7c..e8391b720e51fd62252c220b7d6b2085a234ac19 100644
--- a/chrome/browser/metrics/chromeos_metrics_provider.h
+++ b/chrome/browser/metrics/chromeos_metrics_provider.h
@@ -9,7 +9,9 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/metrics/leak_detector_controller.h"
 #include "chrome/browser/metrics/perf/perf_provider_chromeos.h"
+#include "components/metrics/metrics_flags.h"
 #include "components/metrics/metrics_provider.h"
 
 namespace device {
@@ -80,8 +82,14 @@ class ChromeOSMetricsProvider : public metrics::MetricsProvider {
   // Record the device enrollment status.
   void RecordEnrollmentStatus();
 
+  // For collecting systemwide perf data.
   metrics::PerfProvider perf_provider_;
 
+#if defined(ENABLE_LEAK_DETECTOR)
+  // For runtime memory leak detection

[Alexei Svitkine (slow), 2016/02/18 21:09:19]

Nit: Full sentences.

[Simon Que, 2016/02/19 02:13:02]

Done.

+  metrics::LeakDetectorController leak_detector_controller_;
+#endif
+
   // Bluetooth Adapter instance for collecting information about paired devices.
   scoped_refptr<device::BluetoothAdapter> adapter_;