Add a new Analysis Server flag '--enable-pub-summary-manager'.

pkg/analysis_server/lib/src/server/driver.dart

Index: pkg/analysis_server/lib/src/server/driver.dart
diff --git a/pkg/analysis_server/lib/src/server/driver.dart b/pkg/analysis_server/lib/src/server/driver.dart
index e21d2c869d00242d5226096aa895d1a568b8c272..28deb0921430b3a34886d03b2275e97c534d370a 100644
--- a/pkg/analysis_server/lib/src/server/driver.dart
+++ b/pkg/analysis_server/lib/src/server/driver.dart
@@ -243,6 +243,11 @@ class Driver implements ServerStarter {
       "incremental-resolution-validation";
 
   /**
+   * The name of the option used to enable using pub summary manager.
+   */
+  static const String ENABLE_PUB_SUMMARY_MANAGER = 'enable-pub-summary-manager';
+
+  /**
    * The name of the option used to enable fined grained invalidation.
    */
   static const String FINER_GRAINED_INVALIDATION = 'finer-grained-invalidation';
@@ -378,6 +383,8 @@ class Driver implements ServerStarter {
         results[ENABLE_INCREMENTAL_RESOLUTION_API];
     analysisServerOptions.enableIncrementalResolutionValidation =
         results[INCREMENTAL_RESOLUTION_VALIDATION];
+    analysisServerOptions.enablePubSummaryManager =
+        results[ENABLE_PUB_SUMMARY_MANAGER];
     analysisServerOptions.finerGrainedInvalidation =
         results[FINER_GRAINED_INVALIDATION];
     analysisServerOptions.noErrorNotification = results[NO_ERROR_NOTIFICATION];
@@ -534,6 +541,10 @@ class Driver implements ServerStarter {
         help: "enable validation of incremental resolution results (slow)",
         defaultsTo: false,
         negatable: false);
+    parser.addFlag(ENABLE_PUB_SUMMARY_MANAGER,
+        help: "enable using summaries for pub cache packages",
+        defaultsTo: false,
+        negatable: false);
     parser.addFlag(FINER_GRAINED_INVALIDATION,
         help: "enable finer grained invalidation",
         defaultsTo: false,