aw: Set FullscreenView initial size

This fixes momentarily sending 0x0 size down into content before the
FullscreenView is layed out. The 0x0 size sometimes cause issues and is
generally unexpected in chromium code, so best to avoid it.

Bug: 953868
Change-Id: Ib81707ccb6fc126c714342e6c45c336855d4424b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584469
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654240}
2 files changed