[DO NOT MERGE] Throw exception if slot has invalid offset

Previously the process would crash, which is OK, but complicates testing.

Test: cts-tradefed run cts --module CtsContentTestCases
      --test android.content.cts.ContentProviderCursorWindowTest
Bug: 34128677

AOSP-Change-Id: I5b50982d77ec65c442fbb973d14c85a5c29c43c7
(cherry picked from commit eb6de6f5)
(cherry picked from commit 676f703f)

CVE-2017-0598

Change-Id: If4df1645887525e00c2762d4c702efbccf2e0b5b