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

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

Index: pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
index e79e424e656d1975df979157d4d2a51211ad82eb..703c909e134f2fb602d5a3b8e01281d68682e44e 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
@@ -117,7 +117,7 @@ class ContainerBuilder extends CodeEmitterHelper {
     } else if (member.isInstanceMember) {
       if (needsSuperGetter(member)) {
         ClassElement superClass = member.enclosingClass;
-        String methodName = namer.getNameOfInstanceMember(member);
+        String methodName = namer.instanceMethodName(member);
         // When redirecting, we must ensure that we don't end up in a subclass.
         // We thus can't just invoke `this.foo$1.call(filledInArguments)`.
         // Instead we need to call the statically resolved target.
@@ -131,7 +131,7 @@ class ContainerBuilder extends CodeEmitterHelper {
       } else {
         body = js.statement(
             'return this.#(#);',
-            [namer.getNameOfInstanceMember(member), argumentsBuffer]);
+            [namer.instanceMethodName(member), argumentsBuffer]);
       }
     } else {
       body = js.statement('return #(#)',
@@ -267,7 +267,7 @@ class ContainerBuilder extends CodeEmitterHelper {
     if (member.isAbstract) return null;
     jsAst.Expression code = backend.generatedCode[member];
     if (code == null) return null;
-    String name = namer.getNameOfMember(member);
+    String name = namer.getNameOfMethod(member);
 
     FunctionSignature parameters = member.functionSignature;
     bool needsStubs = !parameters.optionalParameters.isEmpty;
@@ -296,7 +296,7 @@ class ContainerBuilder extends CodeEmitterHelper {
             compiler.codegenWorld.hasInvokedGetter(member, compiler.world) ||
             (canBeReflected && !member.isOperator);
         assert(!needsSuperGetter(member) || canTearOff);
-        tearOffName = namer.getterName(member);
+        tearOffName = namer.getterForElement(member);
       }
     } else {
       canTearOff =