Rendering the window frame with a second thread

Using a multi threaded render node to render the window frame
asynchronously from the application relayout.

Bug: 22527834
Bug: 24400680
Bug: 24459827
Bug: 24409773
Bug: 24537510
Change-Id: I1010fc6a8b6e38424178140afa3ca124433ab7e4
11 files changed