The format of this is a little strange, and has to do with the previous
implementation maintaining a "stack" of objects as it works. As a result,
the format writes the array buffer before giving any hint that the reason
for doing so is to obtain a view wrapping it. Handling this without creating
an explicit on-heap stack requires checking whether the next tag is 'V'
after obtaining an array buffer.

BUG=chromium:148757

Review-Url: https://codereview.chromium.org/2287653002
Cr-Commit-Position: refs/heads/master@{#38984}