Add convenience HighestPriority and LowestPriority methods to QuicUtils.

net/quic/quic_utils.cc

Index: net/quic/quic_utils.cc
diff --git a/net/quic/quic_utils.cc b/net/quic/quic_utils.cc
index cc57cb7b363b218c3a9cd86952a4404093a87023..0aff3772c2655e5c3a2c1f10552537b23ec39103 100644
--- a/net/quic/quic_utils.cc
+++ b/net/quic/quic_utils.cc
@@ -12,6 +12,7 @@
 #include "base/port.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
+#include "net/spdy/write_blocked_list.h"
 
 using base::StringPiece;
 using std::string;
@@ -281,4 +282,14 @@ string QuicUtils::StringToHexASCIIDump(StringPiece in_buffer) {
   return s;
 }
 
+// static
+QuicPriority QuicUtils::LowestPriority() {
+  return static_cast<QuicPriority>(kLowestPriority);
+}
+
+// static
+QuicPriority QuicUtils::HighestPriority() {
+  return static_cast<QuicPriority>(kHighestPriority);
+}
+
 }  // namespace net