GitLab

Add DCHECKs to make sure events have the right type. e.g.
MouseInputEvent has its type field set to one of the
InputEventType::kMouse* types.

Bug: 1091834
Change-Id: I45f2d8b45435e38e2802a5e887bd1c286b4e5c7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367117Reviewed-by: K. Moon <kmoon@chromium.org>
Reviewed-by: Ankit Kumar 🌪️ <ankk@microsoft.com>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800366}