[chromium] Linux ASAN WebKit canary is running out of memory
https://bugs.webkit.org/show_bug.cgi?id=112978

Reviewed by Tony Chang.

Running the AddressSanitizer on a crash takes a lot of
memory, so we should serialize access to it to avoid running
out of memory on a machine.

* Scripts/webkitpy/layout_tests/port/chromium.py:
(ChromiumPort._get_crash_log):
* Scripts/webkitpy/layout_tests/port/http_lock.py:
(HttpLock.__init__):
(HttpLock.wait_for_httpd_lock):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146546 268f45cc-cd09-0410-ab3c-d52691b4dbfc