Compute and cache element NativeBehavior during resolution.

pkg/compiler/lib/src/common/backend_api.dart

Index: pkg/compiler/lib/src/common/backend_api.dart
diff --git a/pkg/compiler/lib/src/common/backend_api.dart b/pkg/compiler/lib/src/common/backend_api.dart
index 080a03b416a96f7d048d823bbefb37682f8da139..70c4d4091951ad255434ed599ac322a1fdcf2fe0 100644
--- a/pkg/compiler/lib/src/common/backend_api.dart
+++ b/pkg/compiler/lib/src/common/backend_api.dart
@@ -44,7 +44,7 @@ import 'registry.dart' show Registry;
 import 'tasks.dart' show CompilerTask;
 import 'work.dart' show ItemCompilationContext;
 
-abstract class Backend implements Target {
+abstract class Backend extends Target {
   final Compiler compiler;
 
   Backend(this.compiler);
@@ -404,6 +404,12 @@ abstract class Backend implements Target {
   EnqueueTask makeEnqueuer() => new EnqueueTask(compiler);
 }
 
+/// Interface for resolving native data for a target specific element.
+abstract class NativeRegistry {
+  /// Registers [nativeData] as part of the resolution impact.
+  void registerNativeData(var nativeData);

[Harry Terkelsen, 2016/06/08 16:34:42]

I think this should be 'NativeBehavior nativeData'

[Johnni Winther, 2016/06/10 07:58:51]

It should have been 'dynamic' (it is in ResolutionWorldImpact). It is
deliberately _not_ NativeBehavior because the actual type is Target specific.

+}
+
 /// Interface for resolving calls to foreign functions.
 abstract class ForeignResolver {
   /// Returns the constant expression of [node], or `null` if [node] is not