[Android] memory_inspector: add resident memory accounting.

[Android] memory_inspector: add resident memory accounting.

Introduce the logic which is able to intersect mmap stats (dirty/clean
priv/shared) with allocations. Essentially it contains the math to
calculate the overlap (even partial) between allocations and mmaps
and attribute stats counters to allocations. For the moment only
resident memory is accounted. Finer grained accounting (dirty/clean)
requires some changes to memdump (to have more than one bit per page in
its output bitmap) and will come soon.

BUG=340294
NOTRY=true

Committed: https://crrev.com/786950036c44447667426bb07a51b911531ccc79
Cr-Commit-Position: refs/heads/master@{#295032}

[Primiano Tucci (use gerrit), 2014-09-12 10:57:14]

Patchset #1 (id:1) has been deleted

[Primiano Tucci (use gerrit), 2014-09-12 10:59:41]

Patchset #1 (id:20001) has been deleted

[Primiano Tucci (use gerrit), 2014-09-12 11:00:09]

primiano@chromium.org changed reviewers:
+ bccheng@chromium.org, hajimehoshi@chromium.org

[Primiano Tucci (use gerrit), 2014-09-12 11:00:10]

Hello Guys,
could you PTAL to this other one.
This is piece to intersect the mmap data with the allocations and get resident
count for each allocation.

[bccheng, 2014-09-15 01:18:24]

lgtm

[bccheng, 2014-09-15 01:18:28]

lgtm

[hajimehoshi, 2014-09-16 02:14:15]

lgtm

[Primiano Tucci (use gerrit), 2014-09-16 08:48:27]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2014-09-16 08:49:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/563183003/40001

[commit-bot: I haz the power, 2014-09-16 08:50:20]

Committed patchset #1 (id:40001) as cead3aa83b120c61c9b0fb1d68f6282faf224e09

[commit-bot: I haz the power, 2014-09-16 08:51:44]

Patchset 1 (id:??) landed as
https://crrev.com/786950036c44447667426bb07a51b911531ccc79
Cr-Commit-Position: refs/heads/master@{#295032}