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Before this patch, encodedBodySize [1] and decodedBodySize [2] fields of
navigation / resource timing entry for Signed Exchanges were not
populated.

After this patch, these fields will have the sizes of Signed Exchange's
inner response body, before and after decoding mi-sha256 encoding.

[1] https://www.w3.org/TR/resource-timing-2/#dom-performanceresourcetiming-encodedbodysize
[2] https://www.w3.org/TR/resource-timing-2/#dom-performanceresourcetiming-decodedbodysize

Bug: 928589
Change-Id: I6b7800497e411822172dea4769ab8fc9d4955b53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496261
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638001}