Create DreamManager System Server TestApi

Bug: 141771803
Bug: 133216167

Test: atest DreamManagerServiceTests
Test: make checkbuild

Merged-In: I937061138bc8ccaf4475674f00331c3fe1c5a495
Change-Id: I937061138bc8ccaf4475674f00331c3fe1c5a495
(cherry picked from commit 4467c53c11c4ebfaf6681b82ec849192eb144a51)
7 files changed