Analyze requested files.

pkg/analyzer/lib/src/dart/analysis/driver.dart

Index: pkg/analyzer/lib/src/dart/analysis/driver.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/driver.dart b/pkg/analyzer/lib/src/dart/analysis/driver.dart
index 1a3ae73c395e5e0f4fd03e0462d4acdcd1057219..b4143ac00619b43ca3dd9c65c9a8bdf5fa17797d 100644
--- a/pkg/analyzer/lib/src/dart/analysis/driver.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/driver.dart
@@ -228,7 +228,18 @@ class AnalysisDriver {
           continue;
         }
 
-        // TODO(scheglov) analyze requested files
+        // Analyze a requested file.
+        if (_requestedFiles.isNotEmpty) {
+          String path = _requestedFiles.keys.first;
+          AnalysisResult result = _computeAnalysisResult(path, withUnit: true);
+          _requestedFiles.remove(path).forEach((completer) {
+            completer.complete(result);
+          });
+          yield result;
+          // Repeat the processing loop.
+          _hasWork.notify();
+          continue;
+        }
 
         // Analyze a priority file.
         if (_priorityFiles.isNotEmpty) {