[chromeos] New PowerManagerClient observer to collect power data.

chromeos/dbus/dbus_thread_manager.h

Index: chromeos/dbus/dbus_thread_manager.h
diff --git a/chromeos/dbus/dbus_thread_manager.h b/chromeos/dbus/dbus_thread_manager.h
index 0a6d35991bd3ca49bad4eaa796e8ed7cbb94cac7..acfed2c97bb3a8ade94ed8182de6f04d7f52e167 100644
--- a/chromeos/dbus/dbus_thread_manager.h
+++ b/chromeos/dbus/dbus_thread_manager.h
@@ -47,6 +47,7 @@ class NfcDeviceClient;
 class NfcManagerClient;
 class NfcTagClient;
 class PermissionBrokerClient;
+class PowerDataCollector;
 class PowerManagerClient;
 class PowerPolicyController;
 class SMSClient;
@@ -139,6 +140,7 @@ class CHROMEOS_EXPORT DBusThreadManager {
   virtual NfcManagerClient* GetNfcManagerClient() = 0;
   virtual NfcTagClient* GetNfcTagClient() = 0;
   virtual PermissionBrokerClient* GetPermissionBrokerClient() = 0;
+  virtual PowerDataCollector* GetPowerDataCollector() = 0;
   virtual PowerManagerClient* GetPowerManagerClient() = 0;
   virtual PowerPolicyController* GetPowerPolicyController() = 0;
   virtual SessionManagerClient* GetSessionManagerClient() = 0;