Add NativeEnqueuer to work with the Enqueuer.

sdk/lib/_internal/compiler/implementation/enqueue.dart

Index: sdk/lib/_internal/compiler/implementation/enqueue.dart
diff --git a/sdk/lib/_internal/compiler/implementation/enqueue.dart b/sdk/lib/_internal/compiler/implementation/enqueue.dart
index eac0761044ab1cad606f5fa68012a26382cd8ee9..584679e337766f8a11874b8959b76e92291aaad7 100644
--- a/sdk/lib/_internal/compiler/implementation/enqueue.dart
+++ b/sdk/lib/_internal/compiler/implementation/enqueue.dart
@@ -41,6 +41,8 @@ class Enqueuer {
   bool queueIsClosed = false;
   EnqueueTask task;
 
+  native.NativeEnqueuer nativeEnqueuer;  // Set by compiler.
+
   Enqueuer(this.name, this.compiler,
            ItemCompilationContext itemCompilationContextCreator())
     : this.itemCompilationContextCreator = itemCompilationContextCreator,
@@ -116,6 +118,8 @@ class Enqueuer {
         && library.uri.toString() == 'dart:isolate') {
       compiler.enableIsolateSupport(library);
     }
+
+    nativeEnqueuer.registerElement(element);
   }
 
   /**
@@ -167,7 +171,11 @@ class Enqueuer {
     if (universe.generatedCode.containsKey(member)) return;
     if (resolvedElements[member] != null) return;
     if (!member.isInstanceMember()) return;
-    if (member.isField()) return;
+    if (member.isField()) {
+      // Native fields need to go into instanceMembersByName as they are virtual
+      // instantiation points and escape points.
+      if (!member.enclosingElement.isNative()) return;
+    }
 
     String memberName = member.name.slowToString();
     Link<Element> members = instanceMembersByName.putIfAbsent(
@@ -203,6 +211,18 @@ class Enqueuer {
       if (universe.hasInvokedSetter(member, compiler)) {
         return addToWorkList(member);
       }
+    } else if (identical(member.kind, ElementKind.FIELD)) {
+      if (member.enclosingElement.isNative()) {
+        // print('process $member');
+        // print('   $memberName:  ${instanceMembersByName[memberName]}');
+        if (universe.hasInvokedGetter(member, compiler) ||
+            universe.hasInvocation(member, compiler)) {
+          nativeEnqueuer.registerFieldLoad(member);
+        }
+        if (universe.hasInvokedSetter(member, compiler)) {
+          nativeEnqueuer.registerFieldStore(member);
+        }
+      }
     }
   }
 
@@ -292,7 +312,18 @@ class Enqueuer {
   void handleUnseenSelector(SourceString methodName, Selector selector) {
     processInstanceMembers(methodName, (Element member) {
       if (selector.applies(member, compiler)) {
-        addToWorkList(member);
+        // print('unseen $selector add $member   ${member.kind}');
+        if (member.isField() && member.enclosingElement.isNative()) {
+          if (selector.isGetter() || selector.isCall()) {
+            nativeEnqueuer.registerFieldLoad(member);
+            nativeEnqueuer.registerFieldStore(member);
+          } else {
+            nativeEnqueuer.registerFieldStore(member);
+            nativeEnqueuer.registerFieldLoad(member);
+          }
+        } else {
+          addToWorkList(member);
+        }
         return true;
       }
       return false;