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This CL fixes a reordering problem between sizing changes and
cross-process postMessages.  Previously, it was possible for a frame
to resize its child frame (forcing layout to guarantee the sizing IPC
is sent), then send it a postMessage, and have the message delivered
before the sizing change.  This is because the browser process might
throttle resizes, in particular if there had been another pending
resize which hadn't been acked by the (child) renderer.  To fix this,
this CL flushes any pending sizing info to the child renderer before
forwarding the postMessage.

Bug: 822958, 828529
Change-Id: I49252ed6f91b5c25be96b210fd3e3c6248f14da6
Reviewed-on: https://chromium-review.googlesource.com/1063310
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Charlie Reis <creis@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560176}