Add a custom ShaderErrorHandler to Nanobench.

In this CL, the custom ShaderErrorHandler retains the existing failure
mode of the DefaultShaderErrorHandler (using SkDEBUGFAILF) to minimize
breakage on the tree.

Change-Id: I52ecbcadf2ce93eaf47bf400b5faa8955f9526ca
Bug: skia:11776
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/388139
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
3 files changed