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With kConsolidatedMovementXY enabled, mouse movement in blink is
calculated by current possiont - last position. The initial
implementation forgot to handle the pepper events.
This CL adds a last_mouse_position_ field in pepper and use it to
compute mouse movement.

Bug: 1013753
Change-Id: I116ead5e7bdd25d15072e8793e8e3eee02cd2b80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864566Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714794}