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=232790

[rmcilroy, 2013-11-01 22:06:34]

Apologies but my previous reland didn't fix the underlying issue on WebKit_tests
properly. This should do so by seperating out the initialization of both lazy
instances (so that the IO only ever happens if GetMaxSharedMemory is called).
Again patch 1 is the original and patch 2 the modifications to make it succeed
on WebKit tests. PTAL.

[jar (doing other things), 2013-11-01 23:34:18]

lgtm

[jln (very slow on Chromium), 2013-11-02 00:44:34]

Zygote lgtm

[rmcilroy, 2013-11-04 07:45:02]

On 2013/11/02 00:44:34, jln wrote:
> Zygote lgtm

Thanks!

[commit-bot: I haz the power, 2013-11-04 07:45:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rmcilroy@chromium.org/55913004/30001

[commit-bot: I haz the power, 2013-11-04 10:17:59]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[commit-bot: I haz the power, 2013-11-04 10:19:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rmcilroy@chromium.org/55913004/30001

[commit-bot: I haz the power, 2013-11-04 12:27:32]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[commit-bot: I haz the power, 2013-11-04 13:41:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rmcilroy@chromium.org/55913004/30001

[commit-bot: I haz the power, 2013-11-04 15:04:16]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-11-04 17:46:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rmcilroy@chromium.org/55913004/30001

[commit-bot: I haz the power, 2013-11-04 20:50:21]

Change committed as 232790