Fix glob patterns to work on Windows

R=scheglov@google.com

Review URL: https://codereview.chromium.org/1426353002 .
diff --git a/pkg/analysis_server/lib/src/plugin/server_plugin.dart b/pkg/analysis_server/lib/src/plugin/server_plugin.dart
index 4aa0c8f..b4de83f 100644
--- a/pkg/analysis_server/lib/src/plugin/server_plugin.dart
+++ b/pkg/analysis_server/lib/src/plugin/server_plugin.dart
@@ -276,10 +276,10 @@
     // Register analyzed file patterns.
     //
     List<String> patterns = <String>[
-      '/**/*.${AnalysisEngine.SUFFIX_DART}',
-      '/**/*.${AnalysisEngine.SUFFIX_HTML}',
-      '/**/*.${AnalysisEngine.SUFFIX_HTM}',
-      '/**/${AnalysisEngine.ANALYSIS_OPTIONS_FILE}'
+      '{*:/,/}**/*.${AnalysisEngine.SUFFIX_DART}',
+      '{*:/,/}**/*.${AnalysisEngine.SUFFIX_HTML}',
+      '{*:/,/}**/*.${AnalysisEngine.SUFFIX_HTM}',
+      '{*:/,/}**/${AnalysisEngine.ANALYSIS_OPTIONS_FILE}'
     ];
     registerExtension(ANALYZED_FILE_PATTERNS_EXTENSION_POINT_ID, patterns);
     //