SF: Verify mDebugDisableHWC forces client composition

Add a composition test to verify that setting setting mDebugDisableHWC
to true causes client composition to be performed.

Test: atest libsurfaceflinger_unittest
Bug: None
Change-Id: Iad5e8fbe4d77ba61460e03c5dfa9c0686e11fcc5
2 files changed