Test span after initial surrounding text retrieval

CL[1] make a deep copy with Parcelable for initial surrounding
text. With CL[1], the text spans after initial surrounding text
retrieval should only have Parcelable spans, and those Parcelable
spans are different from the original Span instance.

[1]: I75edcf6046467f2776d62bb38137f9d15dbfab52

Bug: 163175243
Test: atest FrameworksCoreTests:EditorInfoTest
Change-Id: I9876bf5784bf3c3d93f249f7230a91bb2177e4fd