Store parts in Kernel Library, resynthesize parts in Analyzer.

pkg/kernel/lib/binary/ast_to_binary.dart

Index: pkg/kernel/lib/binary/ast_to_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_to_binary.dart b/pkg/kernel/lib/binary/ast_to_binary.dart
index 7c63b495c1b1f54033558d2ade3f5be33a4d0d93..291908feef1b569d99e59f10211307f9d031d6a4 100644
--- a/pkg/kernel/lib/binary/ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/ast_to_binary.dart
@@ -312,6 +312,7 @@ class BinaryPrinter extends Visitor {
     writeUriReference(node.fileUri ?? '');
     writeAnnotationList(node.annotations);
     writeLibraryDependencies(node);
+    writeLibraryParts(node);
     writeNodeList(node.typedefs);
     writeNodeList(node.classes);
     writeNodeList(node.fields);
@@ -343,6 +344,19 @@ class BinaryPrinter extends Visitor {
     writeStringReferenceList(node.names);
   }
 
+  void writeLibraryParts(Library library) {
+    writeUInt30(library.parts.length);
+    for (int i = 0; i < library.parts.length; ++i) {
+      var partNode = library.parts[i];
+      writeLibraryPart(partNode);
+    }
+  }
+
+  void writeLibraryPart(LibraryPart node) {
+    writeNodeList(node.annotations);
+    writeStringReference(node.fileUri ?? '');
+  }
+
   void visitTypedef(Typedef node) {
     writeCanonicalNameReference(getCanonicalNameOfTypedef(node));
     writeOffset(node.fileOffset);
@@ -1364,6 +1378,12 @@ class StringIndexer extends RecursiveVisitor<Null> {
     node.visitChildren(this);
   }
 
+  @override
+  visitLibraryPart(LibraryPart node) {
+    put(node.fileUri);
+    node.visitChildren(this);
+  }
+
   visitCombinator(Combinator node) {
     node.names.forEach(put);
   }