Prioritize scheduling analysis for priority sources.

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

Index: pkg/analyzer/lib/src/task/driver.dart
diff --git a/pkg/analyzer/lib/src/task/driver.dart b/pkg/analyzer/lib/src/task/driver.dart
index 58aa4af9466798f5913460d05e68724344da1c01..ab8ab9dc706e98f47490ba4994842eee9b4446d8 100644
--- a/pkg/analyzer/lib/src/task/driver.dart
+++ b/pkg/analyzer/lib/src/task/driver.dart
@@ -415,6 +415,11 @@ class WorkItem {
  */
 abstract class WorkManager {
   /**
+   * Notifies the managers that the given set of priority [targets] was set.
+   */
+  void applyPriorityTargets(List<AnalysisTarget> targets);
+
+  /**
    * Return the next [TargetedResult] that this work manager wants to be
    * computed, or `null` if this manager doesn't need any new results.
    */