Remove references to AnalysisDriver from the plugin mixin classes

pkg/analyzer_plugin/lib/plugin/plugin.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart'
     show AnalysisDriverGeneric, AnalysisDriverScheduler;
@@ skipping 173 matching lines @@
     return null;
   }
 
   /**
    * Create an analysis driver that can analyze the files within the given
    * [contextRoot].
    */
   AnalysisDriverGeneric createAnalysisDriver(ContextRoot contextRoot);
 
   /**
+   * Return the driver being used to analyze the file with the given [path].
+   */
+  AnalysisDriverGeneric driverForPath(String path) {

[mfairhurst, 2017/07/05 22:50:51]

Isn't this also a public usage of a private API?

[Brian Wilkerson, 2017/07/05 23:06:49]

Yes, it is. But it seemed like an expedient step toward the goal to get all of
the references out of the mixins at the cost of adding one more to ServerPlugin.
I might regret it, but...

+    ContextRoot contextRoot = contextRootContaining(path);
+    if (contextRoot == null) {
+      return null;
+    }
+    return driverMap[contextRoot];
+  }
+
+  /**
    * Handle an 'analysis.getNavigation' request.
    */
   Future<AnalysisGetNavigationResult> handleAnalysisGetNavigation(
       AnalysisGetNavigationParams params) async {
     return new AnalysisGetNavigationResult(
         <String>[], <NavigationTarget>[], <NavigationRegion>[]);
   }
 
   /**
    * Handle an 'analysis.handleWatchEvents' request.
@@ skipping 367 matching lines @@
       response = new Response(id, requestTime,
           error: new RequestError(
               RequestErrorCode.PLUGIN_ERROR, exception.toString(),
               stackTrace: stackTrace.toString()));
     }
     if (response != null) {
       _channel.sendResponse(response);
     }
   }
 }