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This CL adds the functionality to decode image safely in a utility
process.

The decoding details is hidden behind an interface, for caller to build
unit tests effectively.

Bug: 1058534
Change-Id: Ibbcf7afa4e6d7ee97ed0baa2fcdfacaeddcdcbe6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106768
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Hesen Zhang <hesen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751087}