Add support for D3D11 texture backed EGLImages Implement EGL_ANGLE_image_d3d11_texture extension. Images created with this extension might not be renderable based on bind flags and resource usage of the client provided texture in which case attaching them to a framebuffer won't succeed. The intended use case is to bind the front and back buffers of a swap chain to GL textures that can be used for rendering in the case of the back buffer and as a shader input for the front buffer. Bug: chromium:939655 Change-Id: Ic3328e831880292217b88be84740740df6031fa6 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1646732 Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>