Merge to XFA: Add path service to retrieve test data directory at run time so tests can be run from…

Merge to XFA: Add path service to retrieve test data directory at run time so tests can be run from any directory.

Previously the tests which read test files assume the current directory is under pdfium. Running from any other directory will break the build.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1408003014 .

(cherry picked from commit c0e93a9a942fe7d99800502a61d2fbb58cf9276f)

Conflicts:
	core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp
	fpdfsdk/src/fpdfdoc_embeddertest.cpp
	testing/embedder_test.cpp
	testing/embedder_test.h

Committed: https://pdfium.googlesource.com/pdfium/+/091f7a070d58e1f8de6bbfdc5b60e1cef84e58c3

[Wei Li, 2015-11-09 19:30:29]

CL https://codereview.chromium.org/1353093003 has not merged into XFA, hence the
conflicts.

[Lei Zhang, 2015-11-09 19:59:28]

lgtm

https://codereview.chromium.org/1411403012/diff/1/core/src/fpdfapi/fpdf_parse...
File core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp (right):

https://codereview.chromium.org/1411403012/diff/1/core/src/fpdfapi/fpdf_parse...
core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp:32: 
extra blank line?

[Wei Li, 2015-11-09 20:09:58]

submitting. thanks.

https://codereview.chromium.org/1411403012/diff/1/core/src/fpdfapi/fpdf_parse...
File core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp (right):

https://codereview.chromium.org/1411403012/diff/1/core/src/fpdfapi/fpdf_parse...
core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp:32: 
On 2015/11/09 19:59:28, Lei Zhang wrote:
> extra blank line?

Done.

[Wei Li, 2015-11-09 20:10:06]

Committed patchset #2 (id:20001) manually as
091f7a070d58e1f8de6bbfdc5b60e1cef84e58c3 (presubmit successful).