GetActivePackages() opens "block" apexes with size

"block" apexes require size to open. In GetActivePackages(), size is
retrieved by looking up ApexFileRepository and passed to
ApexFile::Open().

Ignore-AOSP-First: not for S

Bug: 187686900
Test: ApexTestCases
Change-Id: I63779f4f2efb6c741b678a8f2baf727b7da4049a
7 files changed