Add peak memory usage metric

chrome/browser/metrics/chrome_metrics_service_client.cc

Index: chrome/browser/metrics/chrome_metrics_service_client.cc
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.cc b/chrome/browser/metrics/chrome_metrics_service_client.cc
index 98a9764641383a242401db5bc2499ff4d834f3d1..2ec857ff10420ade2cf07f81e848c30f94be42ad 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_client.cc
@@ -742,8 +742,8 @@ void ChromeMetricsServiceClient::CollectFinalHistograms() {
       base::Bind(&ChromeMetricsServiceClient::OnMemoryDetailCollectionDone,
                  weak_ptr_factory_.GetWeakPtr());
 
-  scoped_refptr<MetricsMemoryDetails> details(
-      new MetricsMemoryDetails(callback, &memory_growth_tracker_));
+  scoped_refptr<MetricsMemoryDetails> details(new MetricsMemoryDetails(
+      callback, &memory_growth_tracker_, &peak_memory_usage_tracker_));
   details->StartFetch();
 }