update_engine: Add locations to the MessageLoop calls. When running the unittests with --v=1, this patch will show the location where the tasks were posted to the FakeMessageLoop. BUG=brillo:91 TEST=Ran unittest with --v=1 Change-Id: I0f9b0a3b67a40c26965a396258f1bd45e38f5ba3 Reviewed-on: https://chromium-review.googlesource.com/280568 Tested-by: Alex Deymo <[email protected]> Reviewed-by: Alex Vakulenko <[email protected]> Commit-Queue: Alex Deymo <[email protected]>

diff --git a/update_manager/variable.h b/update_manager/variable.h
index 9f80461..7ce2af8 100644
--- a/update_manager/variable.h
+++ b/update_manager/variable.h

@@ -10,6 +10,7 @@
 #include <string>
 
 #include <base/bind.h>
+#include <base/location.h>
 #include <base/logging.h>
 #include <base/time/time.h>
 #include <chromeos/message_loops/message_loop.h>
@@ -108,6 +109,7 @@
     // first the list of observers.
     if (!observer_list_.empty()) {
       chromeos::MessageLoop::current()->PostTask(
+          FROM_HERE,
           base::Bind(&BaseVariable::OnValueChangedNotification,
                      base::Unretained(this)));
     }