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The md extension options dialog has an inner frame with the options page
contents. The dialog is sized based on the preferred size of the options
page contents using preferred size change events. The options page
contents's size is also dependent on the dialog size, so resizing the
dialog can result in a preferred size change event which then resizes
the dialog size again. Because the options dialog and the options page
contents are on different threads, this size update logic can infinitely
oscillate between two sizes.

This bug became more prominent with two recent changes:
https://crrev.com/581383 - made preferred size changes synchronous
https://crrev.com/582708 - moved preferred size change events from the
middle of a frame to the end of a frame.

This patch adds a delay between getting the preferred size update and
changing the dialog size, fixing the options dialog size oscillation.
This mimics the asynchronous preferred size updates that were done
before https://crrev.com/581383.

Test: manually tested using 4 custom extension options pages (short
quirksmode, tall quirksmode, short html5, and tall html5).

Bug: 882835
Change-Id: I97bd61c3137ae851d855637aed75029bce1e5404
Reviewed-on: https://chromium-review.googlesource.com/c/1259040
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596359}