libbinder_ndk: AParcel_(get|set)DataPosition
This allows you do the following: - a = getPosition - writeInt32(0) - b = getPosition - write data of unknown size - c = getPosition - setPosition(a) - write(c - b) This allows to skip reading the data of unknown size. Bug: 118395170 Test: atest android.binder.cts Change-Id: Id8033705331c6a48327c240ad33bd2d5f9fc190c
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