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If an asynchronous callback is called, it means we must have returned to
the start of the event loop. Ensure that any consumed bufferedAmount is
reflected in that case. Do not reflect bufferedAmount if the EventQueue
is paused, as that means that we may be in a nested event loop.

Add a unit test for this case. Also add a unit test for normal
bufferedAmount behaviour, as there wasn't one.

Add a web platform test for what happens if a sync XHR is performed
between calling send() and looking at bufferedAmount.

BUG=856651

Change-Id: Iafa2d619a1eb5284b64500ac03d336fb6380193b
Reviewed-on: https://chromium-review.googlesource.com/1151086
Commit-Queue: Adam Rice <ricea@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580078}