Empty reflected attributes and string literals in extended attributes.

Source/bindings/scripts/unstable/blink_idl_parser.py

Index: Source/bindings/scripts/unstable/blink_idl_parser.py
diff --git a/Source/bindings/scripts/unstable/blink_idl_parser.py b/Source/bindings/scripts/unstable/blink_idl_parser.py
index 3418c9f37be371534305e553d81f77861354530d..bf40c68e1b7379d5669807aa54321c2e0921f21c 100644
--- a/Source/bindings/scripts/unstable/blink_idl_parser.py
+++ b/Source/bindings/scripts/unstable/blink_idl_parser.py
@@ -305,6 +305,7 @@ class BlinkIDLParser(IDLParser):
                              | ExtendedAttributeArgList
                              | ExtendedAttributeIdent
                              | ExtendedAttributeIdentList
+                             | ExtendedAttributeStringLiteralList
                              | ExtendedAttributeNamedArgList"""
         p[0] = p[1]
 
@@ -371,6 +372,26 @@ class BlinkIDLParser(IDLParser):
         else:
             p[0] = p[1]
 
+    # Blink extension: Add support for compound Extended Attribute values over string literals ("A"|"B")
+    def p_ExtendedAttributeStringLiteralList(self, p):
+        """ExtendedAttributeStringLiteralList : identifier '=' StringLiteralOrList"""
+        value = self.BuildAttribute('VALUE', p[3])
+        p[0] = self.BuildNamed('ExtAttribute', p, 1, value)
+
+    # Blink extension: one or more string literals. The values aren't propagated as literals,
+    # but their by their value only.
+    def p_StringLiteralOrList(self, p):
+        """StringLiteralOrList : StringLiteral '|' StringLiteralOrList
+                               | StringLiteral"""
+        def unwrap_string(ls):
+            """Reach in and grab the string literal's "NAME"."""
+            return ls[1].value
+
+        if len(p) > 3:
+            p[0] = unwrap_string(p[1]) + p[2] + p[3]
+        else:
+            p[0] = unwrap_string(p[1])
+
     def __dir__(self):
         # Remove REMOVED_RULES from listing so yacc doesn't parse them
         # FIXME: Upstream