Add a switch for changing the fd limit on Mac/Linux....

Add a switch for changing the fd limit on Mac/Linux.
Bump up the default fd limit on the Mac; stopgap fix for page cyclers, but something we want long-term to improve performance once we handle fd exhaustion with delays.

BUG=none
TEST=Launching with --file-descriptor-limit=20 should crash the renderer almost immediately.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=18446

[TVL, 2009-06-15 21:39:18]

lgtm

http://codereview.chromium.org/125151/diff/1/2
File chrome/browser/browser_main.cc (right):

http://codereview.chromium.org/125151/diff/1/2#newcode211
Line 211: setrlimit(RLIMIT_NOFILE, &limits);
check return result and LOG(ERROR)/LOG(INFO) if it fails?

http://codereview.chromium.org/125151/diff/1/2#newcode212
Line 212: }
log if get failed?

http://codereview.chromium.org/125151/diff/1001/7
File chrome/common/chrome_switches.cc (right):

http://codereview.chromium.org/125151/diff/1001/7#newcode510
Line 510: const wchar_t kFileDescriptorLimit[]                =
L"file-descriptor-limit";
align = with the otehrs (last few don't seem to align...

[stuartmorgan, 2009-06-15 21:49:25]

http://codereview.chromium.org/125151/diff/1/2
File chrome/browser/browser_main.cc (right):

http://codereview.chromium.org/125151/diff/1/2#newcode211
Line 211: setrlimit(RLIMIT_NOFILE, &limits);
On 2009/06/15 21:39:18, TVL wrote:
> check return result and LOG(ERROR)/LOG(INFO) if it fails?

Done.

http://codereview.chromium.org/125151/diff/1/2#newcode212
Line 212: }
On 2009/06/15 21:39:18, TVL wrote:
> log if get failed?

Done.

http://codereview.chromium.org/125151/diff/1001/7
File chrome/common/chrome_switches.cc (right):

http://codereview.chromium.org/125151/diff/1001/7#newcode510
Line 510: const wchar_t kFileDescriptorLimit[]                =
L"file-descriptor-limit";
On 2009/06/15 21:39:18, TVL wrote:
> align = with the otehrs (last few don't seem to align...

Done (again; helps when I change the variable name *then* align, rather than the
reverse).