After CL:16311550, the piex wasm module C++ provides image photographic
details derived from the RAW image EXIF. Parse the data for display to
users. Store the result in the piex_loader.js {PiexLoaderResponse}.

Update the piex/tests.html with the details parser: output the details
data and hash to the test output. Update golden test file results.

Test: piex/tests.sh PASS, speed unchanged.
Bug: 965370
Change-Id: I9e36ff6bac741d0ba8793b9f4120ec27a8069c55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632133
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665055}