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This header contains serialized and base64-encoded protocol buffers.
This utility simply base64-decodes the serialized data, and then
parses the proto via compiled JSPB parsing.

THis is a reland of
https://chromium-review.googlesource.com/c/chromium/src/+/2301121, restricting
the new build target to only build on Linux.

R=asvitkine, dpranke@google.com
CC=mathias@chromium.org, yangguo@chromium.org

Bug: 1103854
Change-Id: I30bd4d02f89b250c53c06068ab22e97d7fc279ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316448
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Auto-Submit: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791341}