[PointerCapture] Update ArcInputBridgeProtocol to support relative pointer
This adds the input event type POINTER_MOVE_RELATIVE which will be used for relative mouse events. It also adds RelativePointerArgs, which will be used to pass the relative movements. Bug: 114112168 Test: None Change-Id: Id47aeb8d69d1f49446754395963f78b797a38623
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