Move the wire protocol support into the public API

pkg/analysis_server/lib/src/computer/computer_outline.dart

Index: pkg/analysis_server/lib/src/computer/computer_outline.dart
diff --git a/pkg/analysis_server/lib/src/computer/computer_outline.dart b/pkg/analysis_server/lib/src/computer/computer_outline.dart
index a052b13f2ab815327b865e8d01a35cf744b514ac..9b4c9b7170f0446995d3985ef016913b0656006c 100644
--- a/pkg/analysis_server/lib/src/computer/computer_outline.dart
+++ b/pkg/analysis_server/lib/src/computer/computer_outline.dart
@@ -4,8 +4,8 @@
 
 library computer.outline;
 
+import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/collections.dart';
-import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart' as engine;
 import 'package:analyzer/src/generated/source.dart';
@@ -346,13 +346,6 @@ class DartUnitOutlineComputer {
         children: nullIfEmpty(unitContents));
   }
 
-  static String _getTypeParametersStr(TypeParameterList parameters) {
-    if (parameters == null) {
-      return null;
-    }
-    return parameters.toSource();
-  }
-
   Outline _newVariableOutline(String typeName, ElementKind kind,
       VariableDeclaration variable, bool isStatic) {
     SimpleIdentifier nameNode = variable.name;
@@ -374,6 +367,13 @@ class DartUnitOutlineComputer {
     return outline;
   }
 
+  static String _getTypeParametersStr(TypeParameterList parameters) {
+    if (parameters == null) {
+      return null;
+    }
+    return parameters.toSource();
+  }
+
   /**
    * Returns `true` if the given [element] is not `null` and deprecated.
    */