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

Review URL: https://codereview.chromium.org/1411403012 .

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