Compute NativeBehavior for native methods and fields.

pkg/compiler/lib/src/kernel/kernel.dart

Index: pkg/compiler/lib/src/kernel/kernel.dart
diff --git a/pkg/compiler/lib/src/kernel/kernel.dart b/pkg/compiler/lib/src/kernel/kernel.dart
index 35ff9ea49490cf6ea642f34166ab4706265ddc42..b4ff25a039f6f74eab0a206b9e67cb2605c02845 100644
--- a/pkg/compiler/lib/src/kernel/kernel.dart
+++ b/pkg/compiler/lib/src/kernel/kernel.dart
@@ -27,10 +27,12 @@ import '../elements/elements.dart'
         ImportElement,
         LibraryElement,
         LocalFunctionElement,
+        MetadataAnnotation,
         MixinApplicationElement,
         TypeVariableElement;
 import '../elements/modelx.dart' show ErroneousFieldElementX;
 import '../tree/tree.dart' show FunctionExpression, Node;
+import 'constant_visitor.dart';
 import 'kernel_visitor.dart' show IrFunction, KernelVisitor;
 
 typedef void WorkAction();
@@ -217,6 +219,12 @@ class Kernel {
           classNode.implementedTypes.add(interface);
         }
       });
+      addWork(cls.declaration, () {
+        for (MetadataAnnotation metadata in cls.declaration.metadata) {
+          classNode.addAnnotation(
+              const ConstantVisitor().visit(metadata.constant, this));
+        }
+      });
       return classNode;
     });
   }
@@ -391,6 +399,12 @@ class Kernel {
           return true;
         });
       });
+      addWork(function.declaration, () {
+        for (MetadataAnnotation metadata in function.declaration.metadata) {
+          member.addAnnotation(
+              const ConstantVisitor().visit(metadata.constant, this));
+        }
+      });
       return member;
     });
   }
@@ -452,6 +466,12 @@ class Kernel {
             ..parent = fieldNode;
         }
       });
+      addWork(field.declaration, () {
+        for (MetadataAnnotation metadata in field.declaration.metadata) {
+          fieldNode.addAnnotation(
+              const ConstantVisitor().visit(metadata.constant, this));
+        }
+      });
       return fieldNode;
     });
   }