add analysis server --flutter-repo startup flag

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 7f63419006fd6e2ea79544967aa2cd78c2c91aa1..cd843de0c537f028f941ed1264678d64335c1267 100644
--- a/pkg/analysis_server/lib/src/server/driver.dart
+++ b/pkg/analysis_server/lib/src/server/driver.dart
@@ -18,6 +18,7 @@ import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/instrumentation/file_instrumentation.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/plugin/resolver_provider.dart';
+import 'package:analyzer/src/context/builder.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
@@ -196,6 +197,12 @@ class Driver implements ServerStarter {
   static const String FILE_READ_MODE = "file-read-mode";
 
   /**
+   * The name of the flag used when analyzing the flutter repository.
+   * See comments in source for `flutter analyze --watch`.
+   */
+  static const FLUTTER_REPO = "flutter-repo";
+
+  /**
    * The name of the option used to print usage information.
    */
   static const String HELP_OPTION = "help";
@@ -310,6 +317,8 @@ class Driver implements ServerStarter {
     analysisServerOptions.enableVerboseFlutterCompletions =
         results[VERBOSE_FLUTTER_COMPLETIONS];
 
+    ContextBuilderOptions.flutterRepo = results[FLUTTER_REPO];
+
     telemetry.Analytics analytics = telemetry.createAnalyticsInstance(
         'UA-26406144-29', 'analysis-server',
         disableForSession: results[SUPPRESS_ANALYTICS_FLAG]);
@@ -485,6 +494,10 @@ class Driver implements ServerStarter {
         help: "enable sending instrumentation information to a server",
         defaultsTo: false,
         negatable: false);
+    parser.addFlag(FLUTTER_REPO,
+        help: 'used by "flutter analyze" to enable specific lints'
+            ' when analyzing the flutter repository',
+        hide: false);
     parser.addFlag(HELP_OPTION,
         help: "print this help message without starting a server",
         abbr: 'h',