The case that was not coverted well is that
CursorAnchorInfoCompatWrapper could be instantiated
with null object. In such situations, we should
do nothing.

BUG: 17682582
Change-Id: I6625a2f0ed8c5580ed9edfe4728f342da77a8e40

With this CL, the previously used commit indicator was reverted.
Instead we use the add-to-dictionary indicator only at the moment.

This CL also fixes the indicator position in bidi context.

BUG: 17335734
Change-Id: I5f7cf173ddc30876e2b01320acaff8ba4265edf6

This is a follow up CL for Ic8c6fab58c01206872a34e7ee604cdda.

No behavior change is intended in this CL.

BUG: 17365414
BUG: 17335734
Change-Id: I4299536d0cb0c660b7b564653c72c9cb409a7aa5

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