[Android] Introduce libheap_profiler for memory profiling.

libheap_profiler is a standalone, dependency free and efficient library
aimed to profile memory allocations. In a nutshell it is a replacement
for Android's libc.debug.malloc (which is terribly broken, see the BUG).
This change introduces three new targets:
  - libheap_profiler.so: the snoopy library which tracks allocation info.
  - heap_dump: executable to dump the allocation info for a given process.
  - heap_profiler_unittests: because everybody loves unittests.

Goals:
 - Be fast and efficient: the lib intended to be preloaded in the Zygote
    and trace bulky processes like Chrome.
 - Hook calls to mmap and malloc and grab stack traces associated to them.
 - Don't tie particularly to Android, so it can be reused later for Linux.
 - Be extensible, in the sense that allocations made by custom allocators,
   can be individually visible (instead of just all their mmaped arenas).
 - JSON output, as it is meant to be consumed by other tools, not humans.

At the moment, this CL introduces support just for Android.

BUG=382489
NOTRY=true

Review URL: https://codereview.chromium.org/323893002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@281542 0039d316-1c4b-4281-b951-d872f2087c98

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