Reland "Enable SysInfo::AmountOfPhysicalMemory to be called from within the Linux Sandbox"

Reland "Enable SysInfo::AmountOfPhysicalMemory to be called from within the Linux Sandbox"

Trigger caching of SysInfo::AmountOfPhysicalMemory in PreSandboxInit() to enable
it to be called by the renderer process after the sandbox is sealed.

BUG=312241
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=232274

[rmcilroy, 2013-10-30 12:13:03]

This relands https://codereview.chromium.org/28833002/, which was reverted due
to doing IO on a non-IO thread in the Blink layout tests. Patchset 1 is the
original CL reviewed in 28833002, Patchset 2 removes CPUModelName from the
LazySysInfo initializer to avoid doing IO.

PTAL.

[jar (doing other things), 2013-10-31 17:32:11]

lgtm

[jln (very slow on Chromium), 2013-10-31 17:46:40]

On 2013/10/31 17:32:11, jar wrote:
> lgtm

Zygote lgtm

[commit-bot: I haz the power, 2013-10-31 18:01:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rmcilroy@chromium.org/52403002/20001

[commit-bot: I haz the power, 2013-10-31 21:20:43]

Retried try job too often on win_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-10-31 23:42:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rmcilroy@chromium.org/52403002/20001

[commit-bot: I haz the power, 2013-11-01 01:55:44]

Change committed as 232274

[dglazkov, 2013-11-01 03:04:27]

This broke all Linux dbg layout tests again. Please don't land again until
you're sure this won't happen again.

[rmcilroy, 2013-11-01 09:34:34]

On 2013/11/01 03:04:27, Dimitri Glazkov wrote:
> This broke all Linux dbg layout tests again. Please don't land again until
> you're sure this won't happen again.

Apologies Dimitri, I thought I had removed all IO references and tested locally,
but obviously missed one and didn't test the correct configuration locally. I
will make sure it passes on the linux_layout trybot before relanding (I didn't
realise you could run chromium changes through this trybot).