Redo "Steps towards making dart2js JS AST templates an indepentent library."

pkg/compiler/lib/src/use_unused_api.dart

Index: pkg/compiler/lib/src/use_unused_api.dart
diff --git a/pkg/compiler/lib/src/use_unused_api.dart b/pkg/compiler/lib/src/use_unused_api.dart
index 909b0003dba690b2ddfe6b03f2140bd8919c23f0..77f0bc986941febe6a7d0f01c3dac1ebc93f31cc 100644
--- a/pkg/compiler/lib/src/use_unused_api.dart
+++ b/pkg/compiler/lib/src/use_unused_api.dart
@@ -51,10 +51,10 @@ void main(List<String> arguments) {
   useSetlet(null);
   useImmutableEmptySet(null);
   useElementVisitor(new ElementVisitor());
-  useJs(new js.Program(null));
-  useJs(new js.Blob(null));
-  useJs(new js.NamedFunction(null, null));
-  useJs(new js.ArrayHole());
+  useJsNode(new js.Program(null));
+  useJsNode(new js.NamedFunction(null, null));
+  useJsNode(new js.ArrayHole());
+  useJsOther(new js.SimpleJavaScriptPrintingContext());
   useJsBackend(null);
   useConcreteTypesInferrer(null);
   useColor();
@@ -170,10 +170,14 @@ void useElementVisitor(ElementVisitor visitor) {
     ..visitWarnOnUseElement(null);
 }
 
-useJs(js.Node node) {
+useJsNode(js.Node node) {
   node.asVariableUse();
 }
 
+useJsOther(js.SimpleJavaScriptPrintingContext context) {
+  context.getText();
+}
+
 useJsBackend(js_backend.JavaScriptBackend backend) {
   backend.assembleCode(null);
   backend.annotations.noInlining(null);