Support as=<UPPERCASE VALUE> for link preloads in preload scanner

third_party/WebKit/Source/core/html/parser/HTMLPreloadScannerTest.cpp

 // Copyright 2015 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 "core/html/parser/HTMLPreloadScanner.h"
 
 #include "core/MediaTypeNames.h"
 #include "core/css/MediaValuesCached.h"
 #include "core/fetch/ClientHintsPreferences.h"
 #include "core/frame/Settings.h"
@@ skipping 785 matching lines @@
        "http://example.test/", Resource::Script, 0},
       {"http://example.test",
        "<script language='python' src='test.js'></script>", nullptr,
        "http://example.test/", Resource::Script, 0},
   };
 
   for (const auto& testCase : testCases)
     test(testCase);
 }
 
+// Regression test for crbug.com/664744.
+TEST_F(HTMLPreloadScannerTest, testUppercaseAsValues) {
+  TestCase testCases[] = {
+      {"http://example.test", "<link rel=preload href=bla as=SCRIPT>", "bla",
+       "http://example.test/", Resource::Script, 0},
+      {"http://example.test", "<link rel=preload href=bla as=fOnT>", "bla",
+       "http://example.test/", Resource::Font, 0},
+  };
+
+  for (const auto& testCase : testCases)
+    test(testCase);
+}
+
 }  // namespace blink