Remove task inputs performance statistics.

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 c6abda8d4c3cc44ef515df66e5964cf9e379dd8d..fc8d46a10a3e0e7ca81d63261313633ea9b1099e 100644
--- a/pkg/analyzer/lib/src/task/driver.dart
+++ b/pkg/analyzer/lib/src/task/driver.dart
@@ -530,21 +530,6 @@ class StronglyConnectedComponent<Node> {
  */
 class WorkItem {
   /**
-   * A table mapping the names of analysis tasks to the number of times each
-   * kind of task has been performed.
-   */
-  static final Map<TaskDescriptor, int> countMap =
-      new HashMap<TaskDescriptor, int>();
-
-  /**
-   * A table mapping the names of analysis tasks to stopwatches used to compute
-   * how much time was spent between creating an item and creating (for
-   * performing) of each kind of task
-   */
-  static final Map<TaskDescriptor, Stopwatch> stopwatchMap =
-      new HashMap<TaskDescriptor, Stopwatch>();
-
-  /**
    * The context in which the task will be performed.
    */
   final InternalAnalysisContext context;
@@ -565,11 +550,6 @@ class WorkItem {
   final ResultDescriptor spawningResult;
 
   /**
-   * The current inputs computing stopwatch.
-   */
-  Stopwatch stopwatch;
-
-  /**
    * An iterator used to iterate over the descriptors of the inputs to the task,
    * or `null` if all of the inputs have been collected and the task can be
    * created.
@@ -619,19 +599,6 @@ class WorkItem {
       builder = null;
     }
     inputs = new HashMap<String, dynamic>();
-    // Update performance counters.
-    {
-      stopwatch = stopwatchMap[descriptor];
-      if (stopwatch == null) {
-        stopwatch = new Stopwatch();
-        stopwatchMap[descriptor] = stopwatch;
-      }
-      stopwatch.start();
-    }
-    {
-      int count = countMap[descriptor];
-      countMap[descriptor] = count == null ? 1 : count + 1;
-    }
   }
 
   @override
@@ -651,7 +618,6 @@ class WorkItem {
    * Build the task represented by this work item.
    */
   AnalysisTask buildTask() {
-    stopwatch.stop();
     if (builder != null) {
       throw new StateError("some inputs have not been computed");
     }