[Net] Propagate priority changes from URLRequest to HttpTransaction

net/http/http_transaction_unittest.h

Index: net/http/http_transaction_unittest.h
diff --git a/net/http/http_transaction_unittest.h b/net/http/http_transaction_unittest.h
index f1bd78ce124435f0fb7ade64db8bb52250842951..f811f7e1f07840fb8a9a5278a26ed508f1b9971c 100644
--- a/net/http/http_transaction_unittest.h
+++ b/net/http/http_transaction_unittest.h
@@ -189,6 +189,10 @@ class MockNetworkTransaction : public net::HttpTransaction {
   virtual bool GetLoadTimingInfo(
       net::LoadTimingInfo* load_timing_info) const OVERRIDE;
 
+  virtual void SetPriority(net::RequestPriority priority) OVERRIDE;
+
+  net::RequestPriority priority() const { return priority_; }
+
  private:
   void CallbackLater(const net::CompletionCallback& callback, int result);
   void RunCallback(const net::CompletionCallback& callback, int result);
@@ -198,6 +202,7 @@ class MockNetworkTransaction : public net::HttpTransaction {
   std::string data_;
   int data_cursor_;
   int test_mode_;
+  net::RequestPriority priority_;
   base::WeakPtr<MockNetworkLayer> transaction_factory_;
 };