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On the Drallion stylus when the errse button is pressed the digitizer
will send an BTN_TOOL_RUBBER event before a BTN_TOUCH event and then a
BTN_TOOL_PEN. This sequence should be considered an POINTER_TYPE_ERASER
and not a POINTER_TYPE_PEN.

Bug: b:139781900
Change-Id: I268ef0d72e25fa374832ed529a4b54559bc0f805
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076530Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Mathew King <mathewk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746660}