Add an analyzer method to flush resolved ASTs (for testing).

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 7f2eaf110315baaeb531b7b3fb73f25d8279ec01..c9fa7fd8c4547bd2dba9f62d0319be4015ec5ffd 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -2580,6 +2580,12 @@ class AnalysisContextImpl implements InternalAnalysisContext {
   }
 
   @override
+  void test_flushResolvedUnit(Source source) {
+    DartEntry dartEntry = getReadableSourceEntryOrNull(source);
+    dartEntry.flushAstStructures();
+  }
+
+  @override
   bool validateCacheConsistency() {
     int consistencyCheckStart = JavaSystem.nanoTime();
     List<Source> changedSources = new List<Source>();
@@ -4093,13 +4099,6 @@ class AnalysisContextImpl implements InternalAnalysisContext {
   bool _isTooBigHtmlSourceEntry(Source source, SourceEntry sourceEntry) =>
       false;
 
-  /**
-   * Log the given debugging [message].
-   */
-  void _logInformation(String message) {
-    AnalysisEngine.instance.logger.logInformation(message);
-  }
-
 //  /**
 //   * Notify all of the analysis listeners that the given source is no longer included in the set of
 //   * sources that are being analyzed.
@@ -4179,6 +4178,13 @@ class AnalysisContextImpl implements InternalAnalysisContext {
 //  }
 
   /**
+   * Log the given debugging [message].
+   */
+  void _logInformation(String message) {

[Brian Wilkerson, 2015/06/24 16:56:58]

I would have expected "_l" to sort before "_n". Is our sorting broken?

[Paul Berry, 2015/06/24 20:08:32]

Fixed.

+    AnalysisEngine.instance.logger.logInformation(message);
+  }
+
+  /**
    * Notify all of the analysis listeners that a task is about to be performed.
    */
   void _notifyAboutToPerformTask(String taskDescription) {
@@ -9307,6 +9313,12 @@ abstract class InternalAnalysisContext implements AnalysisContext {
   bool shouldErrorsBeAnalyzed(Source source, Object entry);
 
   /**
+   * For testing only: flush any resolution information for the given [source]
+   * out of the cache.
+   */
+  void test_flushResolvedUnit(Source source);
+
+  /**
    * Call the given callback function for eache cache item in the context.
    */
   void visitCacheItems(void callback(Source source, SourceEntry dartEntry,