Trace heap size for allocations

Trace the heap size when we get bulk allocated bytes. This doesn't
happen often for RosAlloc/TLAB and should not hurt
performance.

The motivation is to enable systrace to see allocation behavior of
apps.

Test: test-art-host

Change-Id: I1e373b29507cc64bd5b6ecc9b4e9278399adf4b1
3 files changed