bug:15860114
Savelayers and HW layers both now support shadow casting.
For save layers, the light source should always be correct, for HW
layers, the light source position is set when the layer is created,
and updated when it is resized.
Change-Id: Ie85567dd43c2bb0a0b08fd0bd4db41efa793ac2b
Bug: 15118640
* Prevent over-stuffing the queue by dropping frames
* Prevent double-drawing in one pulse by RT by deferring
vsync registration until post-draw so that it catches
the next vsync pulse instead of the current one
* Bias vsync race condition towards the UI thread
* Fix queueDelay to actually work
Change-Id: Ibf584258bd93ebcbba058bd976dc8b307f1c6155
