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build_output_lut() does not invert a parametric gamma curve when
computing the output curve data. The effect has not been visible
since Chrome only uses the output gamma values from the precache
table (which is inverted).

Make build_output_lut() return inverted data for parametric gamma
curves. Add a test to write the inverted data, and the output of
LCMS function DefaultEvalParametricFn, to a file for comparison.

For now the size of input and output gamma table for parametric
curves is hard-coded to 256; assert this in the test code. See
compute_curve_gamma_table_type_parametric for details. Future
implementations might return an arbitrary-sized table.

BUG=600338

Committed: https://crrev.com/a89370950f514a3df77ed84240d4b8e3abbee801
Cr-Commit-Position: refs/heads/master@{#389754}

Review URL: https://codereview.chromium.org/1862053002

Cr-Commit-Position: refs/heads/master@{#389866}