Show the bottom toolbar without a scroll

Currently if the page has many messages, the bottom toolbar is
not visible till user scrolls(then it becomes floating)

Fix this by triggering a scroll event after messages loaded, to
make sure that toolbar is not inviisible initially

Change-Id: Ic284989e4bcfc8998e9dbee399f7797fe1a4b415
Merge "Show the bottom toolbar without a scroll"