Add major and minor version numbers to summary files.

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

Index: pkg/analyzer/lib/src/summary/idl.dart
diff --git a/pkg/analyzer/lib/src/summary/idl.dart b/pkg/analyzer/lib/src/summary/idl.dart
index f9c37e3b72acaa84061b402314c724edaaf65782..21473a2a0e311de315504842acebab8d2e24f239 100644
--- a/pkg/analyzer/lib/src/summary/idl.dart
+++ b/pkg/analyzer/lib/src/summary/idl.dart
@@ -469,6 +469,20 @@ abstract class PackageBundle extends base.SummaryClass {
   List<String> get linkedLibraryUris;
 
   /**
+   * Major version of the summary format.  See
+   * [PackageBundleAssembler.currentMajorVersion].
+   */
+  @Id(5)
+  int get majorVersion;
+
+  /**
+   * Minor version of the summary format.  See
+   * [PackageBundleAssembler.currentMinorVersion].
+   */
+  @Id(6)
+  int get minorVersion;
+
+  /**
    * List of MD5 hashes of the files listed in [unlinkedUnitUris].  Each hash
    * is encoded as a hexadecimal string using lower case letters.
    */