components/script/dom/bindings/codegen/parser/update.sh now downloads all

the latest *.py tests from
https://hg.mozilla.org/mozilla-central/archive/tip.tar.gz/dom/bindings/parser/tests/

components/script/dom/bindings/codegen/parser/tests/test_promise.py

@@ -0,0 +1,63 @@
+def WebIDLTest(parser, harness):
+    threw = False
+    try:
+        parser.parse("""
+            interface _Promise {};
+            interface A {
+              legacycaller Promise<any> foo();
+            };
+        """)
+        results = parser.finish()
+
+    except:
+        threw = True
+    harness.ok(threw,
+               "Should not allow Promise return values for legacycaller.")
+
+    parser = parser.reset()
+    threw = False
+    try:
+        parser.parse("""
+            interface _Promise {};
+            interface A {
+              Promise<any> foo();
+              long foo(long arg);
+            };
+        """)
+        results = parser.finish();
+    except:
+        threw = True
+    harness.ok(threw,
+               "Should not allow overloads which have both Promise and "
+               "non-Promise return types.")
+
+    parser = parser.reset()
+    threw = False
+    try:
+        parser.parse("""
+            interface _Promise {};
+            interface A {
+              long foo(long arg);
+              Promise<any> foo();
+            };
+        """)
+        results = parser.finish();
+    except:
+        threw = True
+    harness.ok(threw,
+               "Should not allow overloads which have both Promise and "
+               "non-Promise return types.")
+
+    parser = parser.reset()
+    parser.parse("""
+        interface _Promise {};
+        interface A {
+          Promise<any> foo();
+          Promise<any> foo(long arg);
+        };
+    """)
+    results = parser.finish();
+
+    harness.ok(True,
+               "Should allow overloads which only have Promise and return "
+               "types.")