Include classes from patch libraries in x.js.info.html

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

Index: sdk/lib/_internal/compiler/implementation/dump_info.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dump_info.dart b/sdk/lib/_internal/compiler/implementation/dump_info.dart
index 8f6c8e666a6e4801484e9baf201826e3d8038af3..93c3425da219cb7c19e6f9aa96df1b20468446fb 100644
--- a/sdk/lib/_internal/compiler/implementation/dump_info.dart
+++ b/sdk/lib/_internal/compiler/implementation/dump_info.dart
@@ -234,7 +234,12 @@ class InfoDumpVisitor extends ElementVisitor<InfoNode> {
         .getGeneratedSizeOf(element);
     if (size == 0) return null;
     stack.add(element);
-    element.forEachLocalMember((Element member) {
+    // For some reason the patch library contains the origin libraries members,
+    // but the origin library does not contain the patch members.
+    LibraryElement contentsLibrary = element.isPatched
+        ? element.patch
+        : element;
+    contentsLibrary.forEachLocalMember((Element member) {
       InfoNode info = member.accept(this);
       if (info != null) {
         contents.add(info);