Make custom element name checks faster and fewer

third_party/WebKit/Source/platform/text/Character.h

Index: third_party/WebKit/Source/platform/text/Character.h
diff --git a/third_party/WebKit/Source/platform/text/Character.h b/third_party/WebKit/Source/platform/text/Character.h
index 1bef1a6713bfa6b0ebe72430d5ece69e1dd9587b..7db813cd4a8e76d887121af31db455cfae769a8b 100644
--- a/third_party/WebKit/Source/platform/text/Character.h
+++ b/third_party/WebKit/Source/platform/text/Character.h
@@ -36,6 +36,7 @@
 #include "platform/text/TextDirection.h"
 #include "platform/text/TextPath.h"
 #include "platform/text/TextRun.h"
+#include "wtf/ASCIICType.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashSet.h"
 #include "wtf/text/CharacterNames.h"
@@ -81,6 +82,13 @@ public:
     static bool isUprightInMixedVertical(UChar32 character);
 
     // https://html.spec.whatwg.org/multipage/scripting.html#prod-potentialcustomelementname
+    static bool isPotentialCustomElementName8BitChar(LChar ch)
+    {
+        return isASCIILower(ch)
+            || isASCIIDigit(ch)
+            || ch == '-' || ch == '.' || ch == '_' || ch == 0xb7

[esprehn, 2016/09/07 03:54:05]

what char is 0xb7?

+            || (0xc0 <= ch && ch != 0xd7 && ch != 0xf7);

[esprehn, 2016/09/07 03:54:05]

What latin1 chars are these?

+    }
     static bool isPotentialCustomElementNameChar(UChar32 character);
 
     static bool treatAsSpace(UChar32 c)