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We don't support ui::PointerEvents in mus+ash client side right now, so we
need to convert ui::PointerEvent to ui::MouseEvent/ui::TouchEvent until we
have a better solution. This CL adds constructors we need so we can do this
conversion.

Previously this conversion happened when we deserialized mojom::Event to
ui::Event, but that didn't seem the correct place to do it, since we
serialized ui::PointerEvent (and not touch/mouse events) to mojom::Event, and
we should get the same kind of object when deserializing.

BUG=615094

Review-Url: https://codereview.chromium.org/2029713002
Cr-Commit-Position: refs/heads/master@{#397236}