Refactoring BinaryOperationTranslator.

js/src/com/google/dart/compiler/backend/js/ast/JsInvocation.java

@@ -5,6 +5,7 @@
 package com.google.dart.compiler.backend.js.ast;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -65,4 +66,8 @@ public final class JsInvocation extends JsExpression implements HasArguments {
         assert this.args.isEmpty() : "Arguments already set.";
         this.args.addAll(arguments);
     }
+
+    public void setArguments(JsExpression... arguments) {
+        setArguments(Arrays.asList(arguments));
+    }
 }

js/src/com/google/dart/compiler/util/AstUtil.java

@@ -278,7 +278,7 @@ public class AstUtil {
     }
 
     public static JsExpression extractExpressionFromStatement(JsStatement statement) {
-        assert statement instanceof JsExprStmt : "Cannot extract exprssion form statement: " + statement;
+        assert statement instanceof JsExprStmt : "Cannot extract expression from statement: " + statement;
         return (((JsExprStmt) statement).getExpression());
     }