Handle js interop members in impact computation.

pkg/compiler/lib/src/ssa/kernel_impact.dart

Index: pkg/compiler/lib/src/ssa/kernel_impact.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_impact.dart b/pkg/compiler/lib/src/ssa/kernel_impact.dart
index a4e2a3018ae137291e33272e0911871d8f604587..3fd5548e4bbcaa742e0bd1f612581afa86ebf830 100644
--- a/pkg/compiler/lib/src/ssa/kernel_impact.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_impact.dart
@@ -165,9 +165,11 @@ class KernelImpactBuilder extends ir.Visitor {
     handleAsyncMarker(procedure.function.asyncMarker);
     if (procedure.isExternal &&
         !elementAdapter.isForeignLibrary(procedure.enclosingLibrary)) {
-      // TODO(redemption): Provide the correct value for [isJsInterop].
+      MemberEntity member = elementAdapter.getMember(procedure);
+      bool isJsInterop =
+          elementAdapter.nativeBasicData.isJsInteropMember(member);
       impactBuilder.registerNativeData(elementAdapter
-          .getNativeBehaviorForMethod(procedure, isJsInterop: false));
+          .getNativeBehaviorForMethod(procedure, isJsInterop: isJsInterop));
     }
     return impactBuilder;
   }