Letterbox scrolling: out-of-bounds gesture handling

Test: atest FrameworksCoreTests:LetterboxScrollProcessorTest, atest FrameworksCoreTests:InputEventCompatProcessorTest
Flag: com.android.window.flags.scrolling_from_letterbox
Bug: 367328789
Change-Id: I54ad4be34108460b52eb47333217f50b995e78da
5 files changed