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This CL adds fetch uploading 150Mbytes arraybuffer test.

Since similar layouttest was so slow, I decided to test it in browser
test.

Bug: 919361
Change-Id: I693e67666e71b999276f25cfe0c0ff56436c4369
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490964
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821648}