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Add SDK arch directory to test data to allow discovery of SDK libraries.
Adjust test size limits.

Bug: 1126177
Change-Id: I807539c53153af6b804b7bad60c96a8e60fe515b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638075Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Stephen Roe <steveroe@google.com>
Cr-Commit-Position: refs/heads/master@{#845728}