Add average time entries to protobuf

Adding entries for the averaged version of time to full and empty. These
currently will not be used, but in a future CL for powerd I will be using them.

BUG=chromium-os:23647
TEST=Built image and confirmed that it didn't break sending the power status to
     the browser.

Change-Id: Iba9c188ebacc558a71e040392f260bd243bf3f6b
diff --git a/dbus/power_supply_properties.proto b/dbus/power_supply_properties.proto
index cbb8d09..18a6292 100644
--- a/dbus/power_supply_properties.proto
+++ b/dbus/power_supply_properties.proto
@@ -17,13 +17,17 @@
     // Rate of charge/discharge of the battery, in W
     optional double battery_energy_rate = 3;
     optional double battery_voltage = 4;  // Current battery Voltage, in V
-    // Calculated time to battery complete discharge, in S
+    // Calculated time to battery complete discharge, in seconds
     optional int64 battery_time_to_empty = 5;
-    // Calculated time to battery complete charge, in S
+    // Calculated time to battery complete charge, in seconds
     optional int64 battery_time_to_full = 6;
     // Calculated percentage of capacity available
     optional double battery_percentage = 7;
     optional bool battery_is_present = 8;  // Is a battery attached?
     // Is the battery already at full capacity?
     optional bool battery_is_charged = 9;
+    // Averaged time to battery complete discharge, in seconds
+    optional int64 averaged_battery_time_to_empty = 10;
+    // Averaged time to battery complete charge, in seconds
+    optional int64 averaged_battery_time_to_full = 11;
 }
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