AU: Implement getting of tracks through GetTrack.
Add SetTrack and GetTrack to UpdateEngine.xml as well.
BUG=chromium-os:8104
TEST=tested on device with update_engine_client
Change-Id: I10ef2552e9280524b3a8d5f232d104a81a114e06
Review URL: http://codereview.chromium.org/4181001
diff --git a/update_engine.xml b/update_engine.xml
index 73bc92e..2008d2d 100644
--- a/update_engine.xml
+++ b/update_engine.xml
@@ -18,6 +18,9 @@
<arg type="s" name="new_version" direction="out" />
<arg type="x" name="new_size" direction="out" />
</method>
+ <method name="GetTrack">
+ <arg type="s" name="track" direction="out" />
+ </method>
<method name="RebootIfNeeded">
</method>
<method name="SetTrack">