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This commit changes wgpu::Device::CreateSwapChain to take an additional wgpu::Surface argument. Passing nullptr is enough to stay on the previous swapchain implementation, until the new one is ready. In order to support both the "old" implementation-based swapchains and the "new" surface-based swapchains. SwapChainBase is now split into three abstract classes: - SwapChainBase that has a virtual method for each of the wgpu::SwapChain methods. - OldSwapChainBase that corresponds to the implementation-based swapchains. - NewSwapChainBase that will contain the surface-based swapchain implementation and will eventually just be renamed to SwapChainBase. The interaction of the surface-based swapchains with the Surface objects aren't implemented yet, neither are the swapchain methods. Only creation works. Validation tests for surface-based swapchain creation are added in the end2end test target because they need to create OS windows. Bug: dawn:269 Change-Id: I7e07d6c666479867b9a16d7b1b8c181d5dbd69a0 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/15281 Commit-Queue: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org>