[Net] Propagate priority changes from URLRequest to HttpTransaction

net/http/http_transaction_unittest.cc

Index: net/http/http_transaction_unittest.cc
diff --git a/net/http/http_transaction_unittest.cc b/net/http/http_transaction_unittest.cc
index 9eca8c67bef4e24191e15b5d06040b0b8143e15a..366465d933e4ceedbeba7cfbe0970bfc724ec88a 100644
--- a/net/http/http_transaction_unittest.cc
+++ b/net/http/http_transaction_unittest.cc
@@ -218,6 +218,7 @@ void TestTransactionConsumer::OnIOComplete(int result) {
 MockNetworkTransaction::MockNetworkTransaction(MockNetworkLayer* factory)
     : ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
       data_cursor_(0),
+      priority_(net::IDLE),
       transaction_factory_(factory->AsWeakPtr()) {
 }
 
@@ -226,6 +227,8 @@ MockNetworkTransaction::~MockNetworkTransaction() {}
 int MockNetworkTransaction::Start(const net::HttpRequestInfo* request,
                                   const net::CompletionCallback& callback,
                                   const net::BoundNetLog& net_log) {
+  priority_ = request->priority;
+
   const MockTransaction* t = FindMockTransaction(request->url);
   if (!t)
     return net::ERR_FAILED;
@@ -325,6 +328,10 @@ bool MockNetworkTransaction::GetLoadTimingInfo(
   return false;
 }
 
+void MockNetworkTransaction::SetPriority(net::RequestPriority priority) {
+  priority_ = priority;
+}
+
 void MockNetworkTransaction::CallbackLater(
     const net::CompletionCallback& callback, int result) {
   MessageLoop::current()->PostTask(