Use entities in impact transformers.

pkg/compiler/lib/src/common_elements.dart

Index: pkg/compiler/lib/src/common_elements.dart
diff --git a/pkg/compiler/lib/src/common_elements.dart b/pkg/compiler/lib/src/common_elements.dart
index ddc0761bea70e7acaf2ae7902ae57f6fb9d67717..3a5d5d3d4f54db4d1ee39a9a61482ff90aecd5ac 100644
--- a/pkg/compiler/lib/src/common_elements.dart
+++ b/pkg/compiler/lib/src/common_elements.dart
@@ -211,6 +211,9 @@ abstract class CommonElements {
 ///
 /// The _env makes private and injected members directly available and
 /// should therefore not be used to determine scopes.
+// TODO(johnniwinther): Split this into an element environment and a type query
+// interface, the first should only be used during resolution and the latter in
+// both resolution and codegen.
 abstract class ElementEnvironment {
   /// Returns the main library for the compilation.
   LibraryEntity get mainLibrary;
@@ -295,6 +298,15 @@ abstract class ElementEnvironment {
   /// Returns the type if [function].
   FunctionType getFunctionType(FunctionEntity function);
 
+  /// Returns the type of the [local] function.
+  FunctionType getLocalFunctionType(Local local);
+
+  /// Returns the unaliased type of [type].
+  ///
+  /// Use this during resolution to ensure that the alias has been computed.
+  // TODO(johnniwinther): Remove this when the resolver is removed.
+  DartType getUnaliasedType(DartType type);
+
   /// Returns the [CallStructure] corresponding to calling [entity] with all
   /// arguments, both required and optional.
   CallStructure getCallStructure(FunctionEntity entity);