message: clang-win compile files for skia-dawn.
  Do explicit uint8_t -> float conversions (as was previously done for TextureVk).
  Add a missing #include.
diff: @@ -539,7 +539,9 @@ namespace dawn_native { namespace d3d12 {
  DAWN_TRY_ASSIGN(rtvHeap, descriptorHeapAllocator->AllocateCPUHeap(
  D3D12_DESCRIPTOR_HEAP_TYPE_RTV, 1));
  D3D12_CPU_DESCRIPTOR_HANDLE rtvHandle = rtvHeap.GetCPUHandle(0);
  - const float clearColorRGBA[4] = {clearColor, clearColor, clearColor, clearColor};
  + const float fClearColor = static_cast<float>(clearColor);
  + const float clearColorRGBA[4] = {fClearColor, fClearColor, fClearColor,
  + fClearColor};
  // TODO(natlee@microsoft.com): clear all array layers for 2D array textures
  for (uint32_t i = baseMipLevel; i < baseMipLevel + levelCount; i++) {
  