Add "point of interest" app for command-line testing of dart2js type information.

dart/tests/compiler/dart2js/memory_compiler.dart

Index: dart/tests/compiler/dart2js/memory_compiler.dart
diff --git a/dart/tests/compiler/dart2js/memory_compiler.dart b/dart/tests/compiler/dart2js/memory_compiler.dart
index 554098605821c2a2c1010a3ba85acdc83185b3f5..2331004b23151698a7170df87a9debd0bc32449a 100644
--- a/dart/tests/compiler/dart2js/memory_compiler.dart
+++ b/dart/tests/compiler/dart2js/memory_compiler.dart
@@ -125,7 +125,6 @@ Compiler compilerFor(Map<String,String> memorySourceFiles,
                       bool showDiagnostics: true,
                       Uri packageRoot}) {
   Uri libraryRoot = Uri.base.resolve('sdk/');
-  Uri script = Uri.base.resolveUri(Platform.script);

[ahe, 2014/07/10 08:36:07]

Unrelated change, but I noticed this unused variable as I was copying code from
this file to poi.dart.

   if (packageRoot == null) {
     packageRoot = Uri.base.resolveUri(new Uri.file('${Platform.packageRoot}/'));
   }
@@ -238,7 +237,6 @@ Future<MirrorSystem> mirrorSystemFor(Map<String,String> memorySourceFiles,
   Uri libraryRoot = Uri.base.resolve('sdk/');
   Uri packageRoot = Uri.base.resolveUri(
       new Uri.file('${Platform.packageRoot}/'));
-  Uri script = Uri.base.resolveUri(Platform.script);
 
   var provider = new MemorySourceFileProvider(memorySourceFiles);
   var handler =