This is just a follow up CL for Ia8cbb9f6b41cd9509fc0147fd68763df.
No behavial change is intended.

BUG: 17200900
Change-Id: Iba23b731ebde64ec2e816c5b4bef1d93632fce1e

This CL add more compatibility wrapper methods for
CursorAnchorInfo.

This CL also adds more utility functions and types into
CompatUtils to reduce explict cast operations.

Change-Id: Id50165b552bbf28b832a6da13bf06eedcd2a190e

Change-Id: Ia26c783ebefd7b928d623a598792b7ba32d89a80