Fix build on Windows.
Fix build on Windows.

WindowTest.cpp was missing <algorithm> for std::min and std::max.

BUG=angleproject:892

Change-Id: I9bf6e7b8e66cd4ffc34ee639f495b469dabde91a
Reviewed-on: https://chromium-review.googlesource.com/284590
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

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