X11Window: Add missing handling of Keypad's '5' key.
X11Window: Add missing handling of Keypad's '5' key.

BUG=angleproject:891

Change-Id: Icb0dc3449db6982979a93a394fb9e0c58413a256
Reviewed-on: https://chromium-review.googlesource.com/285836
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Tested-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

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