Ensure SkiaPipeline always has a valid colorspace.

Previously we didn't assign a colorspace to the pipeline until it
was provided a surface to render into.  This resulted in undefined
behavior if the application attempted to render an offscreen layer
before the OS provided the main window with its surface. Now instead
of deferring setting whether or not the application is wide gamut we
do initialize it to a default setting when the pipeline is created.

Bug: 148042673
Test: apct/device_boot_health_check_extra_postsubmit
Change-Id: I84d743511e949ac977486470bb14eec936de7f88