Clear mResizedWhileNotDragResizing flag after reporting

Currently mResizedWhileNotDragResizing flag is not cleared after
reporting resize to client, which causes sending lots of resize
messages and relayouts on app side.
This CL introduces another flag to track reporting to app.

Bug: 28696195
Change-Id: Ib5b6ea3e5f499c96057182f4b20583734dea56c4