This reverts ac2582d3 which was a
speculative improvement. It turns out that resizing before the swap is
important as it lets the driver know that it should resize the default
framebuffer, making the following frame have a default framebuffer of
the right size.

BUG=angleproject:1050
BUG=angleproject:892

Change-Id: I84ec3728226fde9fb208f91c02a3d5a1ab71aef8
Reviewed-on: https://chromium-review.googlesource.com/286252Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>