Use the right priority when marking QUIC streams write blocked via

net/quic/quic_session_test.cc

Index: net/quic/quic_session_test.cc
diff --git a/net/quic/quic_session_test.cc b/net/quic/quic_session_test.cc
index 9d4acbfba3cfe1a939d6f83fc9a717c9d27d67fe..20c6f6317ac7cea10dce911e3efeaf58f4b107c1 100644
--- a/net/quic/quic_session_test.cc
+++ b/net/quic/quic_session_test.cc
@@ -32,7 +32,8 @@ namespace net {
 namespace test {
 namespace {
 
-const QuicPriority kSomeMiddlePriority = 2;
+const QuicPriority kHighestPriority = 0;
+const QuicPriority kSomeMiddlePriority = 3;
 
 class TestCryptoStream : public QuicCryptoStream {
  public:
@@ -279,6 +280,32 @@ TEST_P(QuicSessionTest, DecompressionError) {
   }
 }
 
+TEST_P(QuicSessionTest, DebugDFatalIfMarkingClosedStreamWriteBlocked) {
+  TestStream* stream2 = session_.CreateOutgoingDataStream();
+  // Close the stream.
+  stream2->Reset(QUIC_BAD_APPLICATION_PAYLOAD);
+  // TODO(rtenneti): enable when chromium supports EXPECT_DEBUG_DFATAL.
+  /*
+  QuicStreamId kClosedStreamId = stream2->id();
+  EXPECT_DEBUG_DFATAL(
+      session_.MarkWriteBlocked(kClosedStreamId, kSomeMiddlePriority),
+      "Marking unknown stream 2 blocked.");
+  */
+}
+
+TEST_P(QuicSessionTest, DebugDFatalIfMarkWriteBlockedCalledWithWrongPriority) {
+  const QuicPriority kDifferentPriority = 0;
+
+  TestStream* stream2 = session_.CreateOutgoingDataStream();
+  EXPECT_NE(kDifferentPriority, stream2->EffectivePriority());
+  // TODO(rtenneti): enable when chromium supports EXPECT_DEBUG_DFATAL.
+  /*
+  EXPECT_DEBUG_DFATAL(
+      session_.MarkWriteBlocked(stream2->id(), kDifferentPriority),
+      "Priorities do not match.  Got: 0 Expected: 3");
+  */
+}
+
 TEST_P(QuicSessionTest, OnCanWrite) {
   TestStream* stream2 = session_.CreateOutgoingDataStream();
   TestStream* stream4 = session_.CreateOutgoingDataStream();
@@ -314,7 +341,7 @@ TEST_P(QuicSessionTest, BufferedHandshake) {
   EXPECT_FALSE(session_.HasPendingHandshake());
 
   // Blocking (due to buffering of) the Crypto stream is detected.
-  session_.MarkWriteBlocked(kCryptoStreamId, kSomeMiddlePriority);
+  session_.MarkWriteBlocked(kCryptoStreamId, kHighestPriority);
   EXPECT_TRUE(session_.HasPendingHandshake());
 
   TestStream* stream4 = session_.CreateOutgoingDataStream();