Validate cache consistency asynchronously. Compute modification times of physical files in a separa…

pkg/analysis_server/lib/src/operation/operation_analysis.dart

Index: pkg/analysis_server/lib/src/operation/operation_analysis.dart
diff --git a/pkg/analysis_server/lib/src/operation/operation_analysis.dart b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
index 76b27ae1e9e090fcd47c92397443ea7980d8ef52..b99cec3c962d6f50e1e93839a4db7e6a9c494e40 100644
--- a/pkg/analysis_server/lib/src/operation/operation_analysis.dart
+++ b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
@@ -372,12 +372,7 @@ class PerformAnalysisOperation extends ServerOperation {
     List<ChangeNotice> notices = result.changeNotices;
     // nothing to analyze
     if (notices == null) {
-      bool cacheInconsistencyFixed = context.validateCacheConsistency();
-      if (cacheInconsistencyFixed) {
-        server.addOperation(new PerformAnalysisOperation(context, true));
-        return;
-      }
-      // analysis is done
+      server.scheduleCacheConsistencyValidation(context);
       setCacheSize(context, IDLE_CACHE_SIZE);
       server.sendContextAnalysisDoneNotifications(
           context, AnalysisDoneReason.COMPLETE);