DM: display current memory usage (instead of peak) when available.

DM: display current memory usage (instead of peak) when available.

Seems strictly more useful.

This implements Mac and Windows, which seemed easy.  Don't know how to do this on Linux yet.

BUG=skia:

CQ_EXTRA_TRYBOTS=client.skia:Test-Mac10.9-MacMini6.2-HD4000-x86_64-Debug-Trybot

NOTREECHECKS=true
TBR=halcanary@google.com

Committed: https://skia.googlesource.com/skia/+/95553d917c73ef333ede967521560957a5b6a0ad

[mtklein_C, 2015-03-08 16:10:08]

mtklein@chromium.org changed reviewers:
+ halcanary@google.com

[mtklein, 2015-03-08 16:10:46]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-08 16:11:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/990723002/20001

[commit-bot: I haz the power, 2015-03-08 16:11:05]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-03-08 22:11 UTC

[commit-bot: I haz the power, 2015-03-08 16:14:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-08 16:14:36]

Try jobs failed on following builders:
  Build-Win-VS2013-x86_64-Debug-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Win-VS2013-x86...)

[mtklein, 2015-03-08 16:16:42]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-08 16:17:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/990723002/40001

[commit-bot: I haz the power, 2015-03-08 16:17:36]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-03-08 22:17 UTC

[commit-bot: I haz the power, 2015-03-08 22:17:37]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-08 22:17:38]

No LGTM from a valid reviewer yet. Please ask for an LGTM from a
full Skia committer from
https://skia.googlesource.com/skia/+/master/CQ_COMMITTERS

[mtklein, 2015-03-10 19:12:42]

mtklein@google.com changed reviewers:
- halcanary@google.com, mtklein@google.com

[mtklein, 2015-03-10 19:19:51]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-10 19:20:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/990723002/80001

[commit-bot: I haz the power, 2015-03-10 21:21:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-10 21:21:14]

Try jobs failed on following builders:
  Test-Win7-ShuttleA-HD2000-x86-Release-Trybot on client.skia (JOB_TIMED_OUT, no
build URL)
Timed out jobs are not retried to avoid causing additional load on the builders
with large pending queues.

[mtklein, 2015-03-10 21:54:24]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-10 21:54:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/990723002/80001

[commit-bot: I haz the power, 2015-03-11 01:58:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-11 01:58:26]

Try jobs failed on following builders:
  Test-Win7-ShuttleA-HD2000-x86-Release-Trybot on client.skia (JOB_FAILED,
http://build.chromium.org/p/client.skia/builders/Test-Win7-ShuttleA-HD2000-x8...)

[mtklein, 2015-03-12 15:10:05]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-03-12 15:10:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/990723002/80001

[commit-bot: I haz the power, 2015-03-12 15:24:29]

Committed patchset #5 (id:80001) as
https://skia.googlesource.com/skia/+/95553d917c73ef333ede967521560957a5b6a0ad

[hal.canary, 2015-03-16 17:22:33]

halcanary@google.com changed reviewers:
+ halcanary@google.com

[hal.canary, 2015-03-16 17:22:34]

https://codereview.chromium.org/990723002/diff/80001/tools/ProcStats.cpp
File tools/ProcStats.cpp (right):

https://codereview.chromium.org/990723002/diff/80001/tools/ProcStats.cpp#newc...
tools/ProcStats.cpp:50: #else
    #ifdef __linux
    #include <unistd.h>
    #include <stdio.h>
    int sk_tools::getCurrResidentSetSizeMB() {
        long pageSize = sysconf(_SC_PAGESIZE);
        FILE* statm = fopen("/proc/self/statm", "r");
        SkASSERT(statm != NULL);
        long rssPages;
        SkAssertResult(fscanf(statm, "%*d %ld", &rssPages) == 1);
        fclose(statm);
        return SkToInt(((int64_t)rssPages * pageSize) / (1024 * 1024));
    }
    #endif  // __linux