Tweak public APIs and use them in patch_sdk, dart2js, and kernel-service

pkg/kernel/lib/binary/limited_ast_to_binary.dart

Index: pkg/kernel/lib/binary/limited_ast_to_binary.dart
diff --git a/pkg/kernel/lib/binary/limited_ast_to_binary.dart b/pkg/kernel/lib/binary/limited_ast_to_binary.dart
index 6446fe5d06ea0a35aaa47c6a6da88ddf9568b803..e196a76820a9c94c4a083894db3d629f169b0690 100644
--- a/pkg/kernel/lib/binary/limited_ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/limited_ast_to_binary.dart
@@ -13,7 +13,13 @@ import 'package:kernel/binary/ast_to_binary.dart';
 class LimitedBinaryPrinter extends BinaryPrinter {
   final LibraryFilter predicate;
 
-  LimitedBinaryPrinter(Sink<List<int>> sink, this.predicate)
+  /// Excludes also all uriToSource information.

[ahe, 2017/07/06 13:12:22]

"also" implies a context that's kinda missing here.

I'd try something like this:

/// Exclues all uriToSource information in addition to ... (what?).

[Siggi Cherem (dart-lang), 2017/07/06 19:05:28]

Done.

The "what" was is basically everything this class does :) - excluding code and
canonical names for filtered libraries.

+  // TODO(sigmund): provide a way to filter sources based on their
+  // corresponding libraries (or the filter specified above).
+  final bool excludeUriToSource;
+
+  LimitedBinaryPrinter(
+      Sink<List<int>> sink, this.predicate, this.excludeUriToSource)
       : super(sink, stringIndexer: new ReferencesStringIndexer());
 
   @override
@@ -62,6 +68,20 @@ class LimitedBinaryPrinter extends BinaryPrinter {
     if (node is Library && !predicate(node)) return;
     node.accept(this);
   }
+
+  @override
+  void writeUriToSource(Program program) {
+    if (!excludeUriToSource) {
+      super.writeUriToSource(program);
+    } else {
+      // Emit a practically empty uriToSrouce table.
+      writeStringTable(new StringIndexer());
+
+      // Add an entry for '', which is always included by default.
+      writeUtf8Bytes(const <int>[]);
+      writeUInt30(0);
+    }
+  }
 }
 
 /// Extension of [StringIndexer] that also indexes canonical names of