[Net] Propagate priority changes from URLRequest to HttpTransaction

net/http/http_cache_transaction_unittest.cc

Index: net/http/http_cache_transaction_unittest.cc
diff --git a/net/http/http_cache_transaction_unittest.cc b/net/http/http_cache_transaction_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..40fde35d75f4cf7230580b4251ef780ff3f9c77b
--- /dev/null
+++ b/net/http/http_cache_transaction_unittest.cc
@@ -0,0 +1,43 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/http/http_cache_transaction.h"
+
+#include "net/base/test_completion_callback.h"
+#include "net/http/http_cache.h"
+#include "net/http/http_request_info.h"
+#include "net/http/http_transaction_unittest.h"
+#include "net/http/mock_http_cache.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+class HttpCacheTransactionTest : public ::testing::Test {
+ protected:
+  MockHttpCache cache_;
+};
+
+// Make sure that calling HttpCache::Transaction passes on its
+// priority updates to its underlying network transaction.
+TEST_F(HttpCacheTransactionTest, SetPriority) {
+  scoped_ptr<HttpTransaction> trans;
+  ASSERT_EQ(OK, cache_.http_cache()->CreateTransaction(&trans, NULL));
+
+  // Shouldn't crash.
+  trans->SetPriority(LOW);
+
+  HttpRequestInfo info;
+  info.priority = MEDIUM;
+  TestCompletionCallback callback;
+  trans->Start(&info, callback.callback(), BoundNetLog());
+
+  ASSERT_TRUE(cache_.network_layer()->last_transaction());
+  EXPECT_EQ(MEDIUM, cache_.network_layer()->last_transaction()->priority());
+
+  trans->SetPriority(HIGHEST);
+  EXPECT_EQ(HIGHEST, cache_.network_layer()->last_transaction()->priority());
+}
+
+}  // namespace net
+