dart2js: Refactoring, documentation, and a few bugfixes in Namer class.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
index 26e067d77f2d801e76db2313234f44a547c68740..f74c87d635167d4a8a1cfd1b1ad3980db010e138 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
@@ -150,8 +150,7 @@ class OldEmitter implements Emitter {
       => '${namer.isolateName}.${lazyInitializerProperty}';
   String get initName => 'init';
 
-  String get makeConstListProperty
-      => namer.getMappedInstanceName('makeConstantList');
+  String get makeConstListProperty => namer.internGlobal('makeConstantList');
 
   /// The name of the property that contains all field names.
   ///
@@ -162,7 +161,7 @@ class OldEmitter implements Emitter {
   final String deferredInitializers = r"$dart_deferred_initializers";
 
   /// All the global state can be passed around with this variable.
-  String get globalsHolder => namer.getMappedGlobalName("globalsHolder");
+  String get globalsHolder => namer.internGlobal("globalsHolder");
 
   @override
   jsAst.Expression generateEmbeddedGlobalAccess(String global) {
@@ -175,7 +174,7 @@ class OldEmitter implements Emitter {
   }
 
   jsAst.PropertyAccess globalPropertyAccess(Element element) {
-    String name = namer.getNameX(element);
+    String name = namer.globalPropertyName(element);
     jsAst.PropertyAccess pa = new jsAst.PropertyAccess.field(
         new jsAst.VariableUse(namer.globalObjectFor(element)),
         name);
@@ -720,7 +719,7 @@ class OldEmitter implements Emitter {
     void emitInitialization(Element element, jsAst.Expression initialValue) {
       jsAst.Expression init =
         js('$isolateProperties.# = #',
-            [namer.getNameOfGlobalField(element), initialValue]);
+            [namer.globalPropertyName(element), initialValue]);
       output.addBuffer(jsAst.prettyPrint(init, compiler,
                                          monitor: compiler.dumpInfoTask));
       output.add('$N');
@@ -791,7 +790,7 @@ class OldEmitter implements Emitter {
         [js(lazyInitializerName),
             js(isolateProperties),
             js.string(element.name),
-            js.string(namer.getNameX(element)),
+            js.string(namer.globalPropertyName(element)),
             js.string(namer.getLazyInitializerName(element)),
             code]);
   }
@@ -1251,7 +1250,7 @@ class OldEmitter implements Emitter {
       assert(compiler.objectClass != null);
       builder.superName = namer.getNameOfClass(compiler.objectClass);
       jsAst.Node declaration = builder.toObjectInitializer();
-      String mangledName = namer.getNameX(typedef);
+      String mangledName = namer.globalPropertyName(typedef);
       String reflectionName = getReflectionName(typedef, mangledName);
       getElementDescriptor(library)
           ..addProperty(mangledName, declaration)