Add file hashes to SdkBundle; rename to PackageBundle.

pkg/analyzer/lib/src/summary/summarize_elements.dart

Index: pkg/analyzer/lib/src/summary/summarize_elements.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_elements.dart b/pkg/analyzer/lib/src/summary/summarize_elements.dart
index 50f6f7ca75af5e8d8b4aae031449e671c1b5beca..afd3ab1e00ce94fcb6de287ef7ab6353139c0641 100644
--- a/pkg/analyzer/lib/src/summary/summarize_elements.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_elements.dart
@@ -26,8 +26,8 @@ LibrarySerializationResult serializeLibrary(
     LibraryElement lib, TypeProvider typeProvider, bool strongMode) {
   var serializer = new _LibrarySerializer(lib, typeProvider, strongMode);
   LinkedLibraryBuilder linked = serializer.serializeLibrary();
-  return new LibrarySerializationResult(
-      linked, serializer.unlinkedUnits, serializer.unitUris);
+  return new LibrarySerializationResult(linked, serializer.unlinkedUnits,
+      serializer.unitUris, serializer.unitSources);
 }
 
 ReferenceKind _getReferenceKind(Element element) {
@@ -95,7 +95,14 @@ class LibrarySerializationResult {
    */
   final List<String> unitUris;
 
-  LibrarySerializationResult(this.linked, this.unlinkedUnits, this.unitUris);
+  /**
+   * Source object corresponding to each compilation unit appearing in the
+   * library.
+   */
+  final List<Source> unitSources;
+
+  LibrarySerializationResult(
+      this.linked, this.unlinkedUnits, this.unitUris, this.unitSources);
 }
 
 /**
@@ -130,9 +137,9 @@ class _CompilationUnitSerializer {
    */
   final UnlinkedUnitBuilder unlinkedUnit = new UnlinkedUnitBuilder();
 
-/**
- * Absolute URI of the compilation unit.
- */
+  /**
+   * Absolute URI of the compilation unit.
+   */
   String unitUri;
 
   /**
@@ -182,6 +189,11 @@ class _CompilationUnitSerializer {
       this.librarySerializer, this.compilationUnit, this.unitNum);
 
   /**
+   * Source object for the compilation unit.
+   */
+  Source get unitSource => compilationUnit.source;
+
+  /**
    * Add all classes, enums, typedefs, executables, and top level variables
    * from the given compilation unit [element] to the compilation unit summary.
    * [unitNum] indicates the ordinal position of this compilation unit in the
@@ -1317,6 +1329,13 @@ class _LibrarySerializer {
   }
 
   /**
+   * Retrieve a list of the Sources for the compilation units in the library.
+   */
+  List<String> get unitSources => compilationUnitSerializers
+      .map((_CompilationUnitSerializer s) => s.unitSource)
+      .toList();
+
+  /**
    * Retrieve a list of the URIs for the compilation units in the library.
    */
   List<String> get unitUris => compilationUnitSerializers