Fix Java 9 compilation error for portability-core java.lang.NoClassDefFoundError: javax/annotation/Generated: javax.annotation.Generated
Fix Java 9 compilation error for portability-core
java.lang.NoClassDefFoundError: javax/annotation/Generated: javax.annotation.Generated

Tested=I was able to reproduce this when compiling on my mac. Adding the dep explicitly fixed it.

Change-Id: I411e2a9bf218997f13a0fbf44e59d94718095b28

google/data-transfer-project,google/data-transfer-project,google/data-transfer-project,google/data-transfer-project,google/data-transfer-project