update the analyzer and analysis server perf tags

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 bf6da4e2a2f08dddf919538ce3a88c69c7091bbe..3be627954a7b9b08c731882fb89950324832273a 100644
--- a/pkg/analyzer/lib/src/task/driver.dart
+++ b/pkg/analyzer/lib/src/task/driver.dart
@@ -16,11 +16,16 @@ import 'package:analyzer/src/task/inputs.dart';
 import 'package:analyzer/src/task/manager.dart';
 import 'package:analyzer/task/model.dart';
 
+final PerformanceTag driverTag =
+    PerformanceStatistics.analyzer.createChild('driver');

[scheglov, 2017/06/04 00:30:44]

Hm...
We use this tag for different "drivers".

[devoncarew, 2017/06/04 01:45:53]

Updated this one to be 'taskDriver'.

+
+final PerformanceTag driverCacheTag = driverTag.createChild('cache');

[scheglov, 2017/06/04 00:30:44]

Unless I miss something, we use this for the different driver.
So, maybe we should move it there.

[devoncarew, 2017/06/04 01:45:53]

Moved these to 'analysis/driver.dart'.

There are a lot of drivers :)

+
 final PerformanceTag analysisDriverProcessOutputs =
-    new PerformanceTag('AnalysisDriver.processOutputs');
+    driverTag.createChild('processOutputs');
 
 final PerformanceTag workOrderMoveNextPerformanceTag =
-    new PerformanceTag('WorkOrder.moveNext');
+    driverTag.createChild('workOrderMoveNext');
 
 /**
  * An object that is used to cause analysis to be performed until all of the