Daichi Hirono 7f34b20a70 Fix document stack.
We need to add document to stack by using 'push' method instead of 'add'
method.

BUG=26437613

Change-Id: I3e4ac6b0d03cacbe2d6cdd93443ce1c96c8c47d9
2016-01-08 14:33:11 +09:00
..