API functions returning Promises should not throw exceptions.

Source/core/testing/Internals.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 246 matching lines @@
     boolean loseSharedGraphicsContext3D();
 
     [RaisesException] void forceCompositingUpdate(Document document);
 
     void setZoomFactor(float factor);
 
     [RaisesException] void setShouldRevealPassword(Element element, boolean reveal);
 
     [CallWith=ScriptState] Promise createResolvedPromise(any value);
     [CallWith=ScriptState] Promise createRejectedPromise(any reason);
-    [CallWith=ExecutionContext] Promise addOneToPromise(Promise promise);
+    [CallWith=ScriptState] Promise addOneToPromise(Promise promise);
+    [CallWith=ScriptState, RaisesException] Promise promiseCheck(long arg1, boolean arg2, Dictionary arg3, DOMString arg4, DOMString[] arg5);
+    [CallWith=ScriptState] Promise promiseCheckWithoutExceptionState(Dictionary arg1, DOMString arg2, DOMString... variadic);
+    [CallWith=ScriptState] Promise promiseCheckRange([EnforceRange] octet arg1);
 
     void setValueForUser(Element element, DOMString value);
 
     DOMString textSurroundingNode(Node node, long x, long y, unsigned long maxLength);
 
     void setFocused(boolean focused);
 
     [RaisesException] boolean ignoreLayoutWithPendingStylesheets(Document document);
 
     // These functions are for testing NetInfo. You must call setNetworkStateNotifierTestOnly(true)
     // before calling setNetworkConnectionInfo.
     void setNetworkStateNotifierTestOnly(boolean testOnly);
     [RaisesException] void setNetworkConnectionInfo(DOMString type);
 
     // This function is for testing HitRegions on Canvas2D.
     unsigned long countHitRegions(CanvasRenderingContext2D context);
 
     DOMString serializeNavigationMarkup(Document document);
 };