Add a missing visibility modifier to fix build.
Add a missing visibility modifier to fix build.

This class is used by the tests, but is built with -fvisibility=hidden
and not declared as ANDROID_API.

Change-Id: If93af7bfdf0752de1f5bbb10fdd46b2eb9c0ccdd

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base