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Previously we just passed in the containing block size, however this was
incorrect for the following case:
<div style="position: relative; height: 200px;">
  <div style="position: absolute; top: 0; bottom: 100px;">
    <canvas width=1 height=1 style="height: 100%;"></canvas>
  </div>
</div>

This pre-calculates the block-size of the OOF-positioned element, and
pass it into the NGBlockNode::MinMaxSizes pass.

Change-Id: I897dc6f9c157bfa1ae63f9821cdb6ed03a218322
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122854
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Aleks Totic <atotic@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754763}