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.

TEST=Built image and confirmed that it didn't break sending the power status to
     the browser.

Change-Id: Iba9c188ebacc558a71e040392f260bd243bf3f6b
1 file changed
tree: a1ec815ab0e68eb97921e1677e5a5bf06588a2ab
  1. dbus/
  2. window_manager/