[Net] Assert that URLRequests with LOAD_IGNORE_LIMITS have MAXIMUM_PRIORITY

net/socket/client_socket_pool_base.cc

Index: net/socket/client_socket_pool_base.cc
diff --git a/net/socket/client_socket_pool_base.cc b/net/socket/client_socket_pool_base.cc
index 46de10e810f7f8a5eaf45eeeeed495caa53fa8c9..976eec8792ac92c06cba13e4a399dc2455ce3fde 100644
--- a/net/socket/client_socket_pool_base.cc
+++ b/net/socket/client_socket_pool_base.cc
@@ -140,7 +140,10 @@ ClientSocketPoolBaseHelper::Request::Request(
       priority_(priority),
       ignore_limits_(ignore_limits),
       flags_(flags),
-      net_log_(net_log) {}
+      net_log_(net_log) {
+  if (ignore_limits_)
+    DCHECK_EQ(priority_, MAXIMUM_PRIORITY);
+}
 
 ClientSocketPoolBaseHelper::Request::~Request() {}
 
@@ -1131,9 +1134,7 @@ void ClientSocketPoolBaseHelper::TryToCloseSocketsInLayeredPools() {
 
 ClientSocketPoolBaseHelper::Group::Group()
     : unassigned_job_count_(0),
-      // The number of priorities is doubled since requests with
-      // |ignore_limits| are prioritized over other requests.
-      pending_requests_(2 * NUM_PRIORITIES),
+      pending_requests_(NUM_PRIORITIES),
       active_socket_count_(0) {}
 
 ClientSocketPoolBaseHelper::Group::~Group() {
@@ -1270,11 +1271,17 @@ bool ClientSocketPoolBaseHelper::Group::HasConnectJobForHandle(
 
 void ClientSocketPoolBaseHelper::Group::InsertPendingRequest(
     scoped_ptr<const Request> request) {
-  RequestQueue::Priority queue_priority = request->priority();
-  // Prioritize requests with |ignore_limits| over ones that don't.
-  if (request->ignore_limits())
-    queue_priority += NUM_PRIORITIES;
-  pending_requests_.Insert(request.release(), queue_priority);
+  // We must cache this value before we release |request|.
+  RequestPriority priority = request->priority();
+  if (request->ignore_limits()) {
+    // Put requests with ignore_limits == true (which should have
+    // priority == MAXIMUM_PRIORITY) ahead of other requests with
+    // MAXIMUM_PRIORITY.
+    DCHECK_EQ(priority, MAXIMUM_PRIORITY);
+    pending_requests_.InsertAtFront(request.release(), priority);
+  } else {
+    pending_requests_.Insert(request.release(), priority);
+  }
 }
 
 scoped_ptr<const ClientSocketPoolBaseHelper::Request>