Store parts in Kernel Library, resynthesize parts in Analyzer.

pkg/kernel/lib/binary/ast_from_binary.dart

Index: pkg/kernel/lib/binary/ast_from_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index eb261df58cfaec4f7ecc59f65425ad390cbb87db..1c5814732cf40491323070944450d99d2482e72a 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -387,6 +387,7 @@ class BinaryBuilder {
       _skipNodeList(readExpression);
     }
     _readLibraryDependencies(library);
+    _readLibraryParts(library);
     _mergeNamedNodeList(library.typedefs, readTypedef, library);
     _mergeNamedNodeList(library.classes, readClass, library);
     _mergeNamedNodeList(library.fields, readField, library);
@@ -426,6 +427,17 @@ class BinaryBuilder {
     return new List<Combinator>.generate(readUInt(), (i) => readCombinator());
   }
 
+  void _readLibraryParts(Library library) {
+    int length = readUInt();
+    library.parts.length = length;
+    for (int i = 0; i < length; ++i) {
+      var annotations = readExpressionList();
+      var fileUri = readStringOrNullIfEmpty();
+      library.parts[i] = new LibraryPart(annotations, fileUri)
+        ..parent = library;
+    }
+  }
+
   Typedef readTypedef() {
     var canonicalName = readCanonicalNameReference();
     var reference = canonicalName.getReference();