tree fc3888354fcfc138c370c0a21d88a3725eb5ba6b
parent 6dd72696e71fc4b1996cdc97f6481ba2b16528b6
author Mikael Pessa <mikaelpessa@gmail.com> 1550086356 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1550274170 +0000

[scenic] Isolate FrameScheduler

This CL:
* Collect scheduling logic in FrameScheduler
* Decouple Session updates from calls to RenderFrame()
* Simplify program flow from Present() to RenderFrame():
     Previously: Client Session -> SessionHandler -> gfx::Session
              -> SessionManager -> Engine -> FrameScheduler -> Engine
              -> SessionManager -> gfx::Session

     Now: Client Session -> SessionHandler -> gfx::Session
          -> FrameScheduler -> Engine -> gfx::Session

Change-Id: I3000b19fe7836a34595354eea57fe34744fa45eb