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According to the document, the zwp_test_input_v1_send_keysym's argument
named |code| should be XKB keysym.
Currently, XKB keycode is sent, so fixed to the collect one.

BUG=1123705
TEST=Ran locally. Made sure expected keysym is sent to client.

Change-Id: I9db31cf84b21a7c9a400d75bcbec2fbfe69a2ad4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432165Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810912}