Banish SkShaderBase::isRasterPipelineOnly()

Keeping related heuristics in sync with actual shader capabilities is somewhat tricky,
and overall fragile.

So how about this: instead of an explicit opt-in mechanism, try to instantiate a legacy
shader context and fall back to raster pipeline on failure (null Context => implicit
opt-in for raster pipeline).  Shaders can still choose not to draw by returning both a
null Context and failing appendStages().

BUG=skia:7772
Change-Id: I2e76f51af7064853a6cb851b4c30c82eba3ee828
Reviewed-on: https://skia-review.googlesource.com/118383
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>

0 files changed, 0 insertions, 0 deletions