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This CL adds some properties that were missing at PlatformWindow level as well
as code to convert Widget::InitParams into PlatformWindowInitProperties in
DWTHPlatform.

Bug: 789065
Change-Id: Ie224c3ae3434afce0ecdd6d4b044ca9f75f29aca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1718456
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681403}