Annotate targets of implicit this property gets/sets in inference tests.

pkg/front_end/testcases/inference/infer_type_on_var_from_field.dart.strong.expect

Index: pkg/front_end/testcases/inference/infer_type_on_var_from_field.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/infer_type_on_var_from_field.dart.strong.expect b/pkg/front_end/testcases/inference/infer_type_on_var_from_field.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..0d41f9940a0b4e8e46278cfe34425d8d54e8fe21
--- /dev/null
+++ b/pkg/front_end/testcases/inference/infer_type_on_var_from_field.dart.strong.expect
@@ -0,0 +1,23 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class A extends core::Object {
+  field core::int x = 0;
+  field core::int y = null;
+  final field core::int z = 42;
+  constructor •() → void
+    : super core::Object::•()
+    ;
+  method test1() → dynamic {
+    core::int a = this.{self::A::x};
+    a = "hi";
+    a = 3;
+    core::int b = this.{self::A::y};
+    b = "hi";
+    b = 4;
+    core::int c = this.{self::A::z};
+    c = "hi";
+    c = 4;
+  }
+}