Implement "analysis.reanalyze" in analysis server.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index e2f739bcb8ec06d8d8bb42f8e85fb80a23cb77ae..19707578db22cb52855adca6d144f50c3a584e04 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -474,6 +474,17 @@ class AnalysisServer {
   }
 
   /**
+   * Trigger reanalysis of all files from disk.
+   */
+  void reanalyze() {
+    // Clear any operations that are pending.
+    operationQueue.clear();
+    // Instruct the contextDirectoryManager to rebuild all contexts from
+    // scratch.
+    contextDirectoryManager.refresh();
+  }
+
+  /**
    * Remove the given [listener] from the list of listeners that are listening
    * for lifecycle events from this server.
    */