In WinRT XAML, allow eglCreateWindowSurface to be called from any thread Before this change, eglCreateWindowSurface had to be called from one specific XAML thread, which may have been a different thread to the one where rendering was performed. This change fixes this, so eglCreateWindowSurface can be called from any thread. Change-Id: Ic383a508c223d1b0463e8a8f1d8e8d6880c26844 Reviewed-on: https://chromium-review.googlesource.com/300131 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Austin Kinross <aukinros@microsoft.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>