skia/api_mock_gpu_canvas: Crash in unsigned char vector

Project: https://skia.googlesource.com/skia.git Detailed report: https://oss-fuzz.com/testcase?key=5664962896199680 Project: skia Fuzzer: libFuzzerskiaapimockgpucanvas Fuzz target binary: apimockgpucanvas Job Type: libfuzzermsanskia Platform Id: linux Crash Type: UNKNOWN READ Crash Address:...