[Win] Use child win with redirection bitmap for Vulkan-SwiftShader

SwiftShader swap chains use StretchDIBits to drawn content in present().
This is a GDI operation which requires the window to have a Redirection
Bitmap. Therefore, initialize a ChildWindow with a Redirection Bitmap
and use it as the drawing surface when the Dawn backend is Vulkan and
impl is SwiftShader.

Bug: 41241478
Change-Id: I542a9561f22896bb9bc42172517fefe87e79f5ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6506050
Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Sahir Vellani <sahir.vellani@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1456016}