bindings: Correctly expand all class/header dependencies in unions.

third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl

Index: third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
diff --git a/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl b/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
index 1022ee745773fa91fc0a41e37708d263c00cafbc..4e24d28c2a4e6b69bfd850f19e0a9b767816aafd 100644
--- a/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
+++ b/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
@@ -331,6 +331,10 @@ interface TestObject {
     void voidMethodDoubleOrNullOrDOMStringArg((double? or DOMString) arg);
     void voidMethodDOMStringOrArrayBufferOrArrayBufferViewArg((DOMString or ArrayBuffer or ArrayBufferView) arg);
     void voidMethodArrayBufferOrArrayBufferViewOrDictionaryArg((ArrayBuffer or ArrayBufferView or Dictionary) arg);
+    // Unions with types that need extra includes/forward declarations in container types
+    void voidMethodBooleanOrElementSequenceArg((BooleanType or sequence<Element>) arg);
+    void voidMethodDoubleOrLongOrBooleanSequenceArg((double or sequence<(long or boolean)>) arg);
+    void voidMethodElementSequenceOrByteStringDoubleOrStringRecord((sequence<Element> or record<ByteString, (double or DOMString)>) arg);
     // Array of Union types
     void voidMethodArrayOfDoubleOrDOMStringArg((double or DOMString)... arg);
     // Currently only used on interface type arguments