Battery impact UMA

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 14990cffcca8a13265c10c075883454259e91ce4..bcdafb8604f0294133da6c9141b436074109589d 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -116,6 +116,7 @@
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
+#include "content/public/browser/power_usage_monitor.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
@@ -1558,6 +1559,9 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   browser_creator_.reset();
 #endif  // !defined(OS_ANDROID)
 
+  if (g_browser_process->metrics_service()->reporting_active())
+    content::StartPowerUsageMonitor();
+
 #if !defined(OS_ANDROID)
   process_power_collector_.reset(new ProcessPowerCollector);
   process_power_collector_->Initialize();