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Currently the pdf viewer forwards the keyCode property from key events.
However, this property is deprecated, see:
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode

Add the non-deprecated code property to the list of properties to
serialize.

Note: this caused a problem with key handling in Print Preview, when
Print Preview was updated from using keyCode to code to identify the
escape key.

Bug: 890724
Change-Id: I259dd36e344f8a5095487b71df8e96d85e3af47b
Reviewed-on: https://chromium-review.googlesource.com/c/1256111Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596466}