This adds the ability to generate a trivial heap dump on demand. If
the appropriate system properties aren't set, the output file will
instead contain instructions for enabling them.
The data returned by get_malloc_leak_info() is processed and written
to the specified file. The output looks something like:
Android Native Heap Dump v1.0
Total memory: 2981301
Allocation records: 2152
z 1 sz 65557 num 1 bt 8010dd78 afd12618 ...
z 1 sz 52008 num 3 bt 8010dd78 afd12618 ...
z 1 sz 24428 num 1 bt 8010dd78 8010de84 ...
...2149 more...
END
(the "..." is actually the remaining entries in the stack backtrace;
I truncated it here)
"z" indicates whether the allocation was made pre- or post-zygote,
"sz" is the size allocated, and "num" is the number of allocations
made of that size with the specified backtrace.
Change-Id: I2d60f07444fce5f7178b3f51c928c8faa0b051bd
06a6b558bd