Add SurfaceContextReadPixels to excluded wasm tests

Cq-Include-Trybots: luci.skia.skia.primary:Test-Ubuntu18-EMCC-Golo-GPU-QuadroP400-wasm-Release-All-WasmGMTests_WebGL2

Bug: skia:10869
Change-Id: Ib924218aeb4d6dc2e383b86135123efe6eb5639a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/343096
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed