message: Use Swiftshader by default when fuzzing
  Note: This still requires Chromium to have set dawn_swiftshader_dir
  to take effect.
diff: @@ -56,7 +56,8 @@ declare_args() {
  # dawn_swiftshader_dir variable in build_overrides/dawn.gni
  # Because of how the Vulkan loader works, setting this make Dawn only able
  # to find the Swiftshader ICD and not the others.
  - dawn_use_swiftshader = false
  + # Enabled by default when fuzzing.
  + dawn_use_swiftshader = build_with_chromium && use_fuzzing_engine
  # Enables error injection for faking failures to native API calls
  dawn_enable_error_injection =
  