tint->dawn: Shuffle source tree in preperation of merging repos

docs/    -> docs/tint/
fuzzers/ -> src/tint/fuzzers/
samples/ -> src/tint/cmd/
src/     -> src/tint/
test/    -> test/tint/

BUG=tint:1418,tint:1433

Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

test/tint/extract-spvasm.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+
+# Copyright 2021 The Tint 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.
+
+# Extract SPIR-V assembly dumps from the output of
+#    tint_unittests --dump-spirv
+# Writes each module to a distinct filename, which is a sanitized
+# form of the test name, and with a ".spvasm" suffix.
+#
+# Usage:
+#    tint_unittests --dump-spirv | python3 extract-spvasm.py
+
+import sys
+import re
+
+
+def extract():
+    test_name = ''
+    in_spirv = False
+    parts = []
+    for line in sys.stdin:
+        run_match = re.match('\[ RUN\s+\]\s+(\S+)', line)
+        if run_match:
+            test_name = run_match.group(1)
+            test_name = re.sub('[^0-9a-zA-Z]', '_', test_name) + '.spvasm'
+        elif re.match('BEGIN ConvertedOk', line):
+            parts = []
+            in_spirv = True
+        elif re.match('END ConvertedOk', line):
+            with open(test_name, 'w') as f:
+                f.write('; Test: ' + test_name + '\n')
+                for l in parts:
+                    f.write(l)
+                f.close()
+        elif in_spirv:
+            parts.append(line)
+
+
+def main(argv):
+    if '--help' in argv or '-h' in argv:
+        print(
+            'Extract SPIR-V from the output of tint_unittests --dump-spirv\n')
+        print(
+            'Usage:\n    tint_unittests --dump-spirv | python3 extract-spvasm.py\n'
+        )
+        print(
+            'Writes each module to a distinct filename, which is a sanitized')
+        print('form of the test name, and with a ".spvasm" suffix.')
+        return 1
+    else:
+        extract()
+        return 0
+
+
+if __name__ == '__main__':
+    exit(main(sys.argv[1:]))