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Since touchpad gestures will expose as mousewheel events on JS.
Developer may want the modifier state. In this patch, we read the
modifier state and fill it into the event.

Bug: 779372
Change-Id: Idf3ab53433795a40c7e89c887a9bb38a0c9f5f6b
Reviewed-on: https://chromium-review.googlesource.com/996379Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jianpeng Chao <chaopeng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548824}