[automerger skipped] Add relative coordinates for touchpad events. am: 50908afd6e am: 910dc1603b am: ea6efcb112 am: 0c648bf5c9 -s ours

am skip reason: Change-Id Ic96323464af6f11027fbf36ee00e5d226c1b8626 with SHA-1 adb58ead90 is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1447896

Change-Id: Ib8957aa7363b59e3056c032b6f79c9757e9e56c4