Add CompareSpdyHeaderBlocks() test helper method.

net/spdy/spdy_test_utils.h

Index: net/spdy/spdy_test_utils.h
diff --git a/net/spdy/spdy_test_utils.h b/net/spdy/spdy_test_utils.h
index 14bc8efbb4cf138d6085f74270b55d3e447dc292..ee3d6582fb86c0318abd2042098d180f0971bdc2 100644
--- a/net/spdy/spdy_test_utils.h
+++ b/net/spdy/spdy_test_utils.h
@@ -36,6 +36,11 @@ void SetFrameLength(SpdyFrame* frame,
                     size_t length,
                     SpdyMajorVersion spdy_version);
 
+// Returns true if |a| and |b| are the same size, and contain the same
+// entries in the same positions.
+bool CompareSpdyHeaderBlocks(const SpdyHeaderBlock& a,
+                             const SpdyHeaderBlock& b);
+
 std::string a2b_hex(const char* hex_data);
 
 // Returns a SHA1 HashValue in which each byte has the value |label|.
@@ -52,7 +57,6 @@ void AddPin(TransportSecurityState* state,
             uint8_t backup_label);
 
 }  // namespace test
-
 }  // namespace net
 
 #endif  // NET_SPDY_TEST_UTILS_H_