[turbolizer] Redetermine graph bounding box after dragging a node.

tools/turbolizer/graph-view.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 class GraphView extends View {
   constructor (d3, id, nodes, edges, broker) {
     super(id, broker);
     var graph = this;
@@ skipping 453 matching lines @@
     var graph = this,
     state = graph.state,
     consts = graph.consts;
 
     var mouseDownNode = state.mouseDownNode;
 
     if (!mouseDownNode) return;
 
     if (state.justDragged) {
       // dragged, not clicked
+      redetermineGraphBoundingBox(graph);
       state.justDragged = false;
     } else{
       // clicked, not dragged
       var extend = d3.event.shiftKey;
       var selection = graph.state.selection;
       if (!extend) {
         selection.clear();
       }
       selection.select(d3node[0][0], true);
     }
@@ skipping 478 matching lines @@
   }
 
   viewWholeGraph() {
     var graph = this;
     var minScale = graph.minScale();
     var translation = [0, 0];
     translation = graph.getVisibleTranslation(translation, minScale);
     graph.translateClipped(translation, minScale);
   }
 }