libdmabufheap: Adding dmabuf-heap-bench allocation microbenchmark am: 9b799bd36c am: fb727e6af1 am: 046f1ad0ed

Original change: https://android-review.googlesource.com/c/platform/system/memory/libdmabufheap/+/1544038

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I91a293d7f9168ed49cf6c590bb5aba754cc76ee7
tree: b2608dc8ae58234ddab58824a97086de4795d68e
  1. include/
  2. tests/
  3. Android.bp
  4. BufferAllocator.cpp
  5. BufferAllocatorWrapper.cpp