Validate only private sources, display statistics.

pkg/analyzer/lib/src/context/context.dart

Index: pkg/analyzer/lib/src/context/context.dart
diff --git a/pkg/analyzer/lib/src/context/context.dart b/pkg/analyzer/lib/src/context/context.dart
index 964f67911b5208d42702f207595d4bd70018a50a..9790195f3e568cf62b9caff93b654b41b46d9738 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -1379,15 +1379,19 @@ class AnalysisContextImpl implements InternalAnalysisContext {
     int consistencyCheckStart = JavaSystem.nanoTime();
     HashSet<Source> changedSources = new HashSet<Source>();
     HashSet<Source> missingSources = new HashSet<Source>();
-    for (Source source in _cache.sources) {
-      CacheEntry entry = _cache.get(source);
+    for (Source source in _privatePartition.sources) {
+      CacheEntry entry = _privatePartition.get(source);
       int sourceTime = getModificationStamp(source);
       if (sourceTime != entry.modificationTime) {
         changedSources.add(source);
+        PerformanceStatistics
+            .cacheConsistencyValidationStatistics.numOfModified++;
       }
       if (entry.exception != null) {
         if (!exists(source)) {
           missingSources.add(source);
+          PerformanceStatistics
+              .cacheConsistencyValidationStatistics.numOfModified++;
         }
       }
     }