Locate test data more robustly

Locate test data more robustly.

Test code that requires test data should call Paths::TestDataRoot() to
obtain the test data root. This will use the CRASHPAD_TEST_DATA_ROOT
environment variable if set. Otherwise, it will look for test data at
known locations relative to the executable path. If the test data is not
found in any of these locations, it falls back to using the working
directory, the same as the current behavior.

BUG=crashpad:4
TEST=crashpad_util_test Paths.TestDataRoot and others
R=rsesek@chromium.org, scottmg@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/32a9d410ca0b22a17f5eade86057e6c4cdfa7f81

[Mark Mentovai, 2015-03-08 21:34:57]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org, scottmg@chromium.org

[Mark Mentovai, 2015-03-08 21:34:58]

This is important for Chromium integration because it is not normal to have to
run the tests from an specific and odd directory (third_party/crashpad/crashpad)
when running tests in Chromium.

[scottmg, 2015-03-09 17:18:11]

lgtm

https://codereview.chromium.org/992503002/diff/20001/util/test/paths.h
File util/test/paths.h (right):

https://codereview.chromium.org/992503002/diff/20001/util/test/paths.h#newcode1
util/test/paths.h:1: // Copyright 2014 The Crashpad Authors. All rights
reserved.
2015

[Mark Mentovai, 2015-03-09 17:24:15]

https://codereview.chromium.org/992503002/diff/20001/util/test/paths.h
File util/test/paths.h (right):

https://codereview.chromium.org/992503002/diff/20001/util/test/paths.h#newcode1
util/test/paths.h:1: // Copyright 2014 The Crashpad Authors. All rights
reserved.
scottmg wrote:
> 2015

Ugh, this started out as a move of executable_paths.h. You never know what git
is going to detect as a copy…

[Robert Sesek, 2015-03-09 18:51:44]

LGTM

[Mark Mentovai, 2015-03-09 19:13:19]

Committed patchset #4 (id:50001) manually as
32a9d410ca0b22a17f5eade86057e6c4cdfa7f81 (presubmit successful).