Generate the SurfaceFlinger shader cache on initialization

Blobcache is not yet enabled for surfaceflinger (as it should be).
As a temporary workaround, generate all needed shaders during
surfaceflinger initialization instead of doing the compilation
on-demand during ui transitions.

Change-Id: I14455b20a3f85f177d85c9c8b76d8ccc35379b39
2 files changed