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When using vulkan, there is no per-frame Present() call to the window's
scenic session. We need to make sure to call present after a size update
to commit the new size.

Bug: 861853
Test: run_content_shell --ozone-platform=scenic --disable-gpu --enable-vulkan
Change-Id: I7d2788ae6ff641908a10a02d837bea223af6a1ca
Reviewed-on: https://chromium-review.googlesource.com/c/1330291
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607330}