Handle js interop members in impact computation.

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

Index: pkg/compiler/lib/src/kernel/element_map_impl.dart
diff --git a/pkg/compiler/lib/src/kernel/element_map_impl.dart b/pkg/compiler/lib/src/kernel/element_map_impl.dart
index 0ea848812b398acbfc04acced7577e27559a234f..6f5b6de00295a2226db157c2a750b950d4f953a5 100644
--- a/pkg/compiler/lib/src/kernel/element_map_impl.dart
+++ b/pkg/compiler/lib/src/kernel/element_map_impl.dart
@@ -989,9 +989,10 @@ class KernelToElementMapForImpactImpl extends KernelToElementMapBase
         KElementCreatorMixin {
   native.BehaviorBuilder _nativeBehaviorBuilder;
   FrontendStrategy _frontendStrategy;
+  CompilerOptions _options;
 
   KernelToElementMapForImpactImpl(DiagnosticReporter reporter,
-      Environment environment, this._frontendStrategy)
+      Environment environment, this._frontendStrategy, this._options)
       : super(reporter, environment);
 
   @override
@@ -1016,7 +1017,8 @@ class KernelToElementMapForImpactImpl extends KernelToElementMapBase
 
   @override
   native.BehaviorBuilder get nativeBehaviorBuilder =>
-      _nativeBehaviorBuilder ??= new KernelBehaviorBuilder(commonElements);
+      _nativeBehaviorBuilder ??= new KernelBehaviorBuilder(elementEnvironment,
+          commonElements, nativeBasicData, reporter, _options);
 
   ResolutionImpact computeWorldImpact(KMember member) {
     return buildKernelImpact(
@@ -1033,10 +1035,6 @@ class KernelToElementMapForImpactImpl extends KernelToElementMapBase
     return _memberData[method.memberIndex].definition.node;
   }
 
-  Iterable<ConstantValue> _getClassMetadata(KClass cls) {
-    return _classData[cls.classIndex].getMetadata(this);
-  }
-
   @override
   Local getLocalFunction(ir.TreeNode node) {
     assert(
@@ -1378,25 +1376,18 @@ class DartTypeConverter extends ir.DartTypeVisitor<DartType> {
 
 /// [native.BehaviorBuilder] for kernel based elements.
 class KernelBehaviorBuilder extends native.BehaviorBuilder {
+  final ElementEnvironment elementEnvironment;
   final CommonElements commonElements;
+  final DiagnosticReporter reporter;
+  final NativeBasicData nativeBasicData;
+  final CompilerOptions _options;
 
-  KernelBehaviorBuilder(this.commonElements);
+  KernelBehaviorBuilder(this.elementEnvironment, this.commonElements,
+      this.nativeBasicData, this.reporter, this._options);
 
   @override
-  bool get trustJSInteropTypeAnnotations {
-    throw new UnimplementedError(
-        "KernelNativeBehaviorComputer.trustJSInteropTypeAnnotations");
-  }
-
-  @override
-  DiagnosticReporter get reporter {
-    throw new UnimplementedError("KernelNativeBehaviorComputer.reporter");
-  }
-
-  NativeBasicData get nativeBasicData {
-    throw new UnimplementedError(
-        "KernelNativeBehaviorComputer.nativeBasicData");
-  }
+  bool get trustJSInteropTypeAnnotations =>
+      _options.trustJSInteropTypeAnnotations;
 }
 
 /// Constant environment mapping [ConstantExpression]s to [ConstantValue]s using
@@ -1735,8 +1726,7 @@ class KernelNativeMemberResolver extends NativeMemberResolverBase {
 
   @override
   bool isJsInteropMember(MemberEntity element) {
-    // TODO(redemption): Compute this.
-    return false;
+    return nativeBasicData.isJsInteropMember(element);
   }
 }