[dart2dart] Optionally cut types in variable declarations:

lib/compiler/implementation/compiler.dart

Index: lib/compiler/implementation/compiler.dart
diff --git a/lib/compiler/implementation/compiler.dart b/lib/compiler/implementation/compiler.dart
index 4f40c43e3011059dfba6eb0b3d80d0ec6b2e3d43..117468994002c2fd278f3264c665895453a6a158 100644
--- a/lib/compiler/implementation/compiler.dart
+++ b/lib/compiler/implementation/compiler.dart
@@ -168,7 +168,8 @@ class Compiler implements DiagnosticListener {
             this.enableUserAssertions = false,
             bool emitJavascript = true,
             bool generateSourceMap = true,
-            bool minify = false])
+            bool minify = false,
+            bool cutDeclarationTypes = false])
       : libraries = new Map<String, LibraryElement>(),
         world = new World(),
         progress = new Stopwatch.start() {
@@ -185,7 +186,7 @@ class Compiler implements DiagnosticListener {
     typesTask = new ti.TypesTask(this);
     backend = emitJavascript ?
         new js_backend.JavaScriptBackend(this, generateSourceMap) :
-        new dart_backend.DartBackend(this, minify);
+        new dart_backend.DartBackend(this, minify, cutDeclarationTypes);
     enqueuer = new EnqueueTask(this);
     tasks = [scanner, dietParser, parser, resolver, closureToClassMapper,
              checker, typesTask, constantHandler, enqueuer];