[infra] Testrunner fixes for Python3 compatibility

Using UTF-8 encoding couldn't properly read:
test/webkit/parser-high-byte-character.js

Fix itertools rename and one usage of map that's now an iterator.

Bug: chromium:1292016
Cq-Include-Trybots: luci.v8.try.triggered:v8_linux64_python3_rel_ng_triggered
Change-Id: I2b2ab72ce0eb355d1e70f247b5ea38d1d71c7845
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3439914
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78957}

test/intl/testcfg.py

@@ -72,11 +72,13 @@ class TestCase(testcase.D8TestCase):
     return self._env
 
   def _get_files_params(self):
-    files = map(lambda f: os.path.join(self.suite.root, f), [
+    files = [
+      os.path.join(self.suite.root, f) for f in [
         'assert.js',
         'utils.js',
         self.path + self._get_suffix(),
-    ])
+      ]
+    ]
 
     if self._test_config.isolates:
       files += ['--isolate'] + files

tools/testrunner/objects/testcase.py

@@ -75,11 +75,11 @@ except NameError:
   def cmp(x, y):  # Python 3
     return (x > y) - (x < y)
 
-def read_file_utf8(file):
+def read_file(file):
   try:                # Python 3
-    with open(file, encoding='utf-8') as f:
+    with open(file, encoding='ISO-8859-1') as f:
       return f.read()
-  except TypeError:   # Python 2
+  except TypeError:   # Python 2 ..
     with open(file) as f:
       return f.read()
 
@@ -414,7 +414,7 @@ class TestCase(object):
     return self._get_source_path() is not None
 
   def get_source(self):
-    return read_file_utf8(self._get_source_path())
+    return read_file(self._get_source_path())
 
   def _get_source_path(self):
     return None
@@ -460,7 +460,7 @@ class D8TestCase(TestCase):
     """Returns for a given file a list of absolute paths of files needed by the
     given file.
     """
-    source = read_file_utf8(file)
+    source = read_file(file)
     result = []
     def add_path(path):
       result.append(os.path.abspath(path.replace('/', os.path.sep)))

tools/testrunner/outproc/base.py

@@ -2,7 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import itertools
+try: # Python3
+  from itertools import zip_longest
+except ImportError: # Python2
+  from itertools import izip_longest as zip_longest
 
 from ..testproc.base import (
     DROP_RESULT, DROP_OUTPUT, DROP_PASS_OUTPUT, DROP_PASS_STDOUT)
@@ -146,7 +149,7 @@ class ExpectedOutProc(OutProc):
       expected_lines = f.readlines()
 
     for act_iterator in self._act_block_iterator(output):
-      for expected, actual in itertools.izip_longest(
+      for expected, actual in zip_longest(
           self._expected_iterator(expected_lines),
           act_iterator,
           fillvalue=''

tools/testrunner/outproc/message.py

@@ -2,10 +2,14 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import itertools
 import os
 import re
 
+try: # Python3
+  from itertools import zip_longest
+except ImportError: # Python2
+  from itertools import izip_longest as zip_longest
+
 from . import base
 
 
@@ -44,7 +48,7 @@ class OutProc(base.ExpectedOutProc):
     env = {
       'basename': os.path.basename(base_path),
     }
-    for (expected, actual) in itertools.izip_longest(
+    for (expected, actual) in zip_longest(
         expected_lines, actual_lines, fillvalue=''):
       pattern = re.escape(expected.rstrip() % env)
       pattern = pattern.replace('\\*', '.*')