Documents that BalsaFrame happily parses header field names containing double quote.

PiperOrigin-RevId: 543432615

quiche/balsa/balsa_frame_test.cc

diff --git a/quiche/balsa/balsa_frame_test.cc b/quiche/balsa/balsa_frame_test.cc
index 854959a..52f84ce 100644
--- a/quiche/balsa/balsa_frame_test.cc
+++ b/quiche/balsa/balsa_frame_test.cc
@@ -2581,9 +2581,6 @@
 };
 
 TEST_F(BalsaFrameParsingTest, AppropriateActionTakenWhenHeaderColonsAreFunny) {
-  // Believe it or not, the following message is not structured willy-nilly.
-  // It is structured so that both codepaths in both SSE2 and non SSE2 paths
-  // for finding colons are exersized.
   std::string message =
       "GET / HTTP/1.1\r\n"
       "a\r\n"
@@ -3287,6 +3284,18 @@
             balsa_frame_.ErrorCode());
 }
 
+TEST_F(HTTPBalsaFrameTest, KeyHasDoubleQuote) {
+  const std::string message =
+      "GET / HTTP/1.1\r\n"
+      "key\"hasquote: lock\r\n"
+      "\r\n";
+  EXPECT_EQ(message.size(),
+            balsa_frame_.ProcessInput(message.data(), message.size()));
+  EXPECT_FALSE(balsa_frame_.Error());
+  EXPECT_EQ(BalsaFrameEnums::BALSA_NO_ERROR, balsa_frame_.ErrorCode());
+  EXPECT_TRUE(headers_.HasHeader("key\"hasquote"));
+}
+
 // Missing colon is a warning, not an error.
 TEST_F(HTTPBalsaFrameTest, TrailerMissingColon) {
   std::string headers =