[Android] memory_inspector: bug / UI fixes.

[Android] memory_inspector: bug / UI fixes.

This is a set of bug / UI fixes for memory inspector, in preparetion
for next CLs which will introduce integration with libheap_profiler.
Changes in this CL:
- Introduce mmap de-offset heplers (will be used soon for intersecting
  native heap traces).
- Fix symbol lookup for shared_library Chrome builds.
- Add RSS column to mmaps table.
- Add server crash / unreachable detection.
- Update prebuilts (add also desktop ones for paul.whitton@)
- Make it possible to filter tests ran by run_tests.
- Minor cosmetic bugfixes.

BUG=340294
Committed: https://crrev.com/cd68dea40b1d339929d99f18d328a2df724a8f77
Cr-Commit-Position: refs/heads/master@{#294193}

[Primiano Tucci (use gerrit), 2014-09-10 15:26:01]

Patchset #1 (id:1) has been deleted

[Primiano Tucci (use gerrit), 2014-09-10 16:30:53]

primiano@chromium.org changed reviewers:
+ johnme@chromium.org

[Primiano Tucci (use gerrit), 2014-09-10 16:30:54]

Actually, do you mind if I postpone running webkitpy formatter later in the
stage?
I have other CLs based on top of this one. If I run it now it will be a hell for
solving conflicts.

https://codereview.chromium.org/559023002/diff/20001/tools/memory_inspector/m...
File tools/memory_inspector/memory_inspector/backends/prebuilts_fetcher.py
(left):

https://codereview.chromium.org/559023002/diff/20001/tools/memory_inspector/m...
tools/memory_inspector/memory_inspector/backends/prebuilts_fetcher.py:16:
_PREBUILTS_BUCKET = 'chromium-telemetry'
I am moving this to constants.py as I plan to use it also from PRESUBMIT.py.

[johnme, 2014-09-10 17:18:37]

LGTM, all looks reasonable :)

[Primiano Tucci (use gerrit), 2014-09-10 17:20:58]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2014-09-10 17:21:53]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/primiano@chromium.org/559023002/20001

[commit-bot: I haz the power, 2014-09-10 18:20:02]

Committed patchset #1 (id:20001) as 6e17e5b32eebce077b54448ce83d38fb89567ac9

[commit-bot: I haz the power, 2014-09-10 18:24:47]

Patchset 1 (id:??) landed as
https://crrev.com/cd68dea40b1d339929d99f18d328a2df724a8f77
Cr-Commit-Position: refs/heads/master@{#294193}