Start adding experimental incremental analysis mode into CLI analyzer.

pkg/analyzer_cli/lib/src/options.dart

Index: pkg/analyzer_cli/lib/src/options.dart
diff --git a/pkg/analyzer_cli/lib/src/options.dart b/pkg/analyzer_cli/lib/src/options.dart
index 5a2e93972865d15c4d22c3006d4ca28abe33fe7f..4cd4c6c8ddbcd7af2df28891dcf44b630713b24c 100644
--- a/pkg/analyzer_cli/lib/src/options.dart
+++ b/pkg/analyzer_cli/lib/src/options.dart
@@ -112,6 +112,9 @@ class CommandLineOptions {
   /// Whether to use machine format for error display
   final bool machineFormat;
 
+  /// The path to the root folder of the incremental cache.
+  final String incrementalCachePath;
+
   /// The path to the package root
   final String packageRootPath;
 
@@ -176,6 +179,7 @@ class CommandLineOptions {
         lints = args['lints'],
         log = args['log'],
         machineFormat = args['machine'] || args['format'] == 'machine',
+        incrementalCachePath = args['incremental-cache-path'],
         packageConfigPath = args['packages'],
         packageRootPath = args['package-root'],
         perfReport = args['x-perf-report'],
@@ -351,6 +355,13 @@ class CommandLineOptions {
           allowMultiple: true,
           splitCommas: false)
       //
+      // Incremental analysis.
+      //
+      ..addOption('incremental-cache-path',
+          help: 'The path to the folder with information to support '
+              'incremental analysis, e.g. summary files, errors, etc.',
+          hide: true)
+      //
       // Build mode.
       //
       ..addFlag('persistent_worker',