[net/dns] Perform A/AAAA queries for AF_UNSPEC resolutions in parallel.

net/dns/host_resolver_impl.h

Index: net/dns/host_resolver_impl.h
===================================================================
--- net/dns/host_resolver_impl.h	(revision 212872)
+++ net/dns/host_resolver_impl.h	(working copy)
@@ -223,8 +223,9 @@
   // and resulted in |net_error|.
   void OnDnsTaskResolve(int net_error);
 
-  // Allows the tests to catch slots leaking out of the dispatcher.
-  size_t num_running_jobs_for_tests() const {
+  // Allows the tests to catch slots leaking out of the dispatcher.  One
+  // HostResolverImpl::Job moccupy multiple PrioritizedDispatcher job slots.

[szym, 2013/08/06 20:35:31]

moccupy => could occupy
Probably OK to skip HostResolverImpl::

[mmenke, 2013/08/19 17:31:11]

Done.
Since Job is overloaded (PrioritiedDispatcher has them and HostResolverImpl has
them), I prefer to keep the "HostResolverImpl::" prefix, to reduce ambiguity.

+  size_t num_running_dispatcher_jobs_for_tests() const {
     return dispatcher_.num_running_jobs();
   }