[chromeos] New PowerManagerClient observer to collect power data.

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 13279e87be8f44220b34bfbb98c6703093355752..73109a99d764b4cd7b9ef92afd871862a0cae54e 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -93,6 +93,7 @@
 #include "chromeos/network/network_change_notifier_chromeos.h"
 #include "chromeos/network/network_change_notifier_factory_chromeos.h"
 #include "chromeos/network/network_handler.h"
+#include "chromeos/power/power_data_collector.h"
 #include "chromeos/system/statistics_provider.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
@@ -338,6 +339,10 @@ ChromeBrowserMainPartsChromeos::~ChromeBrowserMainPartsChromeos() {
   if (KioskModeSettings::Get()->IsKioskModeEnabled())
     ShutdownKioskModeScreensaver();
 
+  // Since DBusThreadManager is shutdown via the DBusServices destructor, it is
+  // safe to shutdown the PowerDataCollector here.
+  PowerDataCollector::Shutdown();
+
   // To be precise, logout (browser shutdown) is not yet done, but the
   // remaining work is negligible, hence we say LogoutDone here.
   BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutDone", false);
@@ -399,6 +404,10 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopStart() {
 
   dbus_services_.reset(new internal::DBusServices(parameters()));
 
+  // Initialize power data collector only after DBusThreadManager is initialized
+  // in the DBusServices.
+  PowerDataCollector::Initialize();
+
   ChromeBrowserMainPartsLinux::PostMainMessageLoopStart();
 }