Update the wire-based fuzzers to always assume an injected error

This also removes the ability for the fuzzer to perform error
injection to generate testcases. The preferred method is to
use one of the Dawn test binaries to produce the trace directly.

Bug: dawn:629
Change-Id: If7295f9e6da5618be8f44e9301aa12dc56fcdfef
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/40301
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

scripts/update_fuzzer_seed_corpus.sh

@@ -1,98 +0,0 @@
-#!/bin/bash
-
-# Copyright 2019 The Dawn Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Generates a seed corpus for fuzzing based on dumping wire traces
-# from running Dawn tests
-
-# Exit if anything fails
-set -e
-
-if [ "$#" -lt 3 ]; then
-cat << EOF
-
-Usage:
-  $0 <out_dir> <fuzzer_name> <test_name> [additional_test_args...]
-
-Example:
-  $0 out/fuzz dawn_wire_server_and_vulkan_backend_fuzzer dawn_end2end_tests --gtest_filter=*Vulkan
-
-EOF
-    exit 1
-fi
-
-all_args=("$@")
-out_dir=$1
-fuzzer_name=$2
-test_name=$3
-additional_test_args=("${all_args[@]:3}")
-
-testcase_dir="/tmp/testcases/${fuzzer_name}/"
-injected_error_testcase_dir="/tmp/testcases/${fuzzer_name}_injected/"
-minimized_testcase_dir="/tmp/testcases/${fuzzer_name}_minimized/"
-
-# Print commands so it's clear what is being executed
-set -x
-
-# Make a directory for temporarily storing testcases
-mkdir -p "$testcase_dir"
-
-# Make an empty directory for temporarily storing testcases with injected errors
-rm -rf "$injected_error_testcase_dir"
-mkdir -p "$injected_error_testcase_dir"
-
-# Make an empty directory for temporarily storing minimized testcases
-rm -rf "$minimized_testcase_dir"
-mkdir -p "$minimized_testcase_dir"
-
-# Build the fuzzer and test
-autoninja -C $out_dir $fuzzer_name $test_name
-
-fuzzer_binary="${out_dir}/${fuzzer_name}"
-test_binary="${out_dir}/${test_name}"
-
-# Run the test binary
-$test_binary --use-wire --wire-trace-dir="$testcase_dir" $additional_test_args
-
-# Run the fuzzer over the testcases to inject errors
-$fuzzer_binary --injected-error-testcase-dir="$injected_error_testcase_dir" -runs=0 "$testcase_dir"
-
-# Run the fuzzer to minimize the testcases + injected errors
-$fuzzer_binary -merge=1 "$minimized_testcase_dir" "$injected_error_testcase_dir" "$testcase_dir"
-
-# Turn off command printing
-set +x
-
-if [ -z "$(ls -A $minimized_testcase_dir)" ]; then
-cat << EOF
-
-Minimized testcase directory is empty!
-Are you building with use_libfuzzer=true ?
-
-EOF
-    exit 1
-fi
-
-cat << EOF
-
-Please test the corpus in $minimized_testcase_dir with $fuzzer_name and confirm it works as expected.
-
-    $fuzzer_binary $minimized_testcase_dir
-
-Then, run the following command to upload new testcases to the seed corpus:
-
-    gsutil -m rsync $minimized_testcase_dir gs://clusterfuzz-corpus/libfuzzer/${fuzzer_name}/
-
-EOF