Fix generator to use SerializedScriptValue for all postMessages

tools/dom/scripts/generator.py

Index: tools/dom/scripts/generator.py
diff --git a/tools/dom/scripts/generator.py b/tools/dom/scripts/generator.py
index 5caca40bd46c4693714b729db8c547132560980a..a1ebfe29f6617515150723175d055d38d825c227 100644
--- a/tools/dom/scripts/generator.py
+++ b/tools/dom/scripts/generator.py
@@ -722,11 +722,12 @@ dart2js_conversions = monitored.Dict('generator.dart2js_conversions', {
     'any set IDBCursor.update': _serialize_SSV,
 
     # postMessage
+    'SerializedScriptValue set': _serialize_SSV,
+    'any set CompositorWorkerGlobalScope.postMessage': _serialize_SSV,
+    'any set DedicatedWorkerGlobalScope.postMessage': _serialize_SSV,
     'any set MessagePort.postMessage': _serialize_SSV,
-    'SerializedScriptValue set Window.postMessage': _serialize_SSV,
-    'SerializedScriptValue set Worker.postMessage': _serialize_SSV,
-    'any set DedicatedWorkerGlobalScope.postMessage' : _serialize_SSV,
-    'SerializedScriptValue set ServiceWorkerClient.postMessage': _serialize_SSV,
+    'any set Window.postMessage': _serialize_SSV,
+    'any set _DOMWindowCrossFrame.postMessage': _serialize_SSV,

[terry, 2016/02/23 14:19:04]

I'm wondering how the tests ran on integration w/o any problems.

Do we need to add postMessage for ServieWorkerClient?

There are some other like CrossOriginServiceWorker (I guess that's
_DOMWindowCrossFrame)?

What about postMessage in CompositeWorkerGlobalScope?

Noticed we never did this for ServiceWorker in 39/45 there is a postMessage
shouldn't that have been there too?

There is a postMessage in ServicePort for 45 should that be here too?

And what about Worker it was in 39 and there's still a postMessage in 45?

[Alan Knight, 2016/02/23 17:54:37]

Good question. Maybe there's some interaction with something else that happened
on master in between?
I don't see that class. But this covers everything in dart:html, except that it
turns out for _DOMWindowCrossFrame it's from template and I need to fix that
one.
CrossOriginServiceWorkerClient gets generated correctly without the special case
here.
I think you mean Compositor...  That's in there, it's the second one in the
list.
As above, everything in dart:html should be good now.

 
     '* get CustomEvent.detail':
       Conversion('convertNativeToDart_SerializedScriptValue',
@@ -1469,7 +1470,7 @@ def isList(return_type):
   return return_type.startswith('List<') if return_type else False
 
 def get_list_type(return_type):
-  # Get the list type NNNN inside of List<NNNN> 
+  # Get the list type NNNN inside of List<NNNN>
   return return_type[5:-1] if isList(return_type) else return_type
 
 def wrap_unwrap_list_blink(return_type, type_registry):