Make raw-output-tests ignore changes in absolute path of Chromium repo.

Before this change, tests of raw output of the rewriter (i.e. tests run
without passing --apply-edits to tools/clang/scripts/test_tool.py) might
need to encode the full, absolute path in the test expectations.  This
meant that the tests wouldn't work on another developer's machine (where
Chromium repo might be in a different location).

After this change:
- tools/clang/rewrite_raw_ptr_fields/tests/gen-*-expected.txt
  expectation files use paths delative to the
  rewrite_raw_ptr_fields/tests/ directory (rather than hardcoding a
  value of
  .../lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests
- tools/clang/scripts/test_tool.py normalizes paths in the raw output
  (only if invoked without --apply-edits) to make the paths relative to
  the tests directory

Bug: 1069567
Change-Id: I03c54374bb861904e439e677a271b0dec1502b67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2282888
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786330}

tools/clang/rewrite_raw_ptr_fields/tests/gen-char-expected.txt

 ==== BEGIN EDITS ====
-include-user-header:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-char-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-char-actual.cc:::1343:::6:::CheckedPtr<char> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-char-actual.cc:::1361:::12:::CheckedPtr<const char> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-char-actual.cc:::1391:::9:::CheckedPtr<wchar_t> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-char-actual.cc:::1417:::15:::CheckedPtr<const wchar_t> 
+include-user-header:::gen-char-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
+r:::gen-char-actual.cc:::1343:::6:::CheckedPtr<char> 
+r:::gen-char-actual.cc:::1361:::12:::CheckedPtr<const char> 
+r:::gen-char-actual.cc:::1391:::9:::CheckedPtr<wchar_t> 
+r:::gen-char-actual.cc:::1417:::15:::CheckedPtr<const wchar_t> 
 ==== END EDITS ====
 ==== BEGIN FIELD FILTERS ====
 MyStruct::char_ptr  # char

tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-expected.txt

 ==== BEGIN EDITS ====
-include-user-header:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::1090:::3:::CheckedPtr<T> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::2875:::3:::CheckedPtr<T> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::789:::11:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::813:::11:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::842:::11:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::871:::11:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-in-out-arg-actual.cc:::907:::11:::CheckedPtr<SomeClass> 
+include-user-header:::gen-in-out-arg-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
+r:::gen-in-out-arg-actual.cc:::1090:::3:::CheckedPtr<T> 
+r:::gen-in-out-arg-actual.cc:::2875:::3:::CheckedPtr<T> 
+r:::gen-in-out-arg-actual.cc:::789:::11:::CheckedPtr<SomeClass> 
+r:::gen-in-out-arg-actual.cc:::813:::11:::CheckedPtr<SomeClass> 
+r:::gen-in-out-arg-actual.cc:::842:::11:::CheckedPtr<SomeClass> 
+r:::gen-in-out-arg-actual.cc:::871:::11:::CheckedPtr<SomeClass> 
+r:::gen-in-out-arg-actual.cc:::907:::11:::CheckedPtr<SomeClass> 
 ==== END EDITS ====
 ==== BEGIN FIELD FILTERS ====
 my_namespace::MyStruct::in_out_via_auto_reset  # addr-of

tools/clang/rewrite_raw_ptr_fields/tests/gen-macros-expected.txt

 ==== BEGIN EDITS ====
-include-user-header:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-macros-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-macros-actual.cc:::1940:::13:::CheckedPtr<struct event> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-macros-actual.cc:::2009:::14:::CheckedPtr<struct event *> 
+include-user-header:::gen-macros-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
+r:::gen-macros-actual.cc:::1940:::13:::CheckedPtr<struct event> 
+r:::gen-macros-actual.cc:::2009:::14:::CheckedPtr<struct event *> 
 ==== END EDITS ====
 ==== BEGIN FIELD FILTERS ====
 MacroTest1::ptr_field  # macro

tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-expected.txt

 ==== BEGIN EDITS ====
-include-user-header:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::1095:::11:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::1140:::27:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::1385:::54:::CheckedPtr<struct NonFreeStandingStruct> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::1744:::64:::CheckedPtr<struct NonFreeStandingStruct2> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::1780:::11:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::941:::11:::CheckedPtr<SomeClass> 
-r:::/usr/local/google/home/lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests/gen-overlapping-actual.cc:::941:::28:::CheckedPtr<SomeClass> 
+include-user-header:::gen-overlapping-actual.cc:::-1:::-1:::base/memory/checked_ptr.h
+r:::gen-overlapping-actual.cc:::1095:::11:::CheckedPtr<SomeClass> 
+r:::gen-overlapping-actual.cc:::1140:::27:::CheckedPtr<SomeClass> 
+r:::gen-overlapping-actual.cc:::1385:::54:::CheckedPtr<struct NonFreeStandingStruct> 
+r:::gen-overlapping-actual.cc:::1744:::64:::CheckedPtr<struct NonFreeStandingStruct2> 
+r:::gen-overlapping-actual.cc:::1780:::11:::CheckedPtr<SomeClass> 
+r:::gen-overlapping-actual.cc:::941:::11:::CheckedPtr<SomeClass> 
+r:::gen-overlapping-actual.cc:::941:::28:::CheckedPtr<SomeClass> 
 ==== END EDITS ====
 ==== BEGIN FIELD FILTERS ====
 my_namespace::MyStruct::overlapping_1a  # overlapping

tools/clang/scripts/test_tool.py

@@ -13,6 +13,7 @@ import glob
 import json
 import os
 import os.path
+import re
 import shutil
 import subprocess
 import sys
@@ -126,6 +127,28 @@ def _ApplyTool(tools_clang_scripts_directory,
     _RunGit(args)
 
 
+def _NormalizePathInRawOutput(path, test_dir):
+  if not os.path.isabs(path):
+    path = os.path.join(test_dir, path)
+
+  return os.path.relpath(path, test_dir)
+
+
+def _NormalizeSingleRawOutputLine(output_line, test_dir):
+  if not re.match('^[^:]+(:::.*){4,4}$', output_line):
+    return output_line
+
+  edit_type, path, offset, length, replacement = output_line.split(':::', 4)
+  path = _NormalizePathInRawOutput(path, test_dir)
+  return "%s:::%s:::%s:::%s:::%s" % (edit_type, path, offset, length,
+                                     replacement)
+
+
+def _NormalizeRawOutput(output_lines, test_dir):
+  return map(lambda line: _NormalizeSingleRawOutputLine(line, test_dir),
+             output_lines)
+
+
 def main(argv):
   parser = argparse.ArgumentParser()
   parser.add_argument(
@@ -209,6 +232,11 @@ def main(argv):
       expected_output = f.readlines()
     with open(actual, 'r') as f:
       actual_output =  f.readlines()
+    if not args.apply_edits:
+      actual_output = _NormalizeRawOutput(actual_output,
+                                          test_directory_for_tool)
+      expected_output = _NormalizeRawOutput(expected_output,
+                                            test_directory_for_tool)
     if actual_output != expected_output:
       failed += 1
       lines = difflib.unified_diff(expected_output, actual_output,