supersize: Track symbol aliases and shared symbols

tools/binary_size/libsupersize/template/D3SymbolTreeMap.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // TODO:
 // 1. Visibility functions: base on boxPadding.t, not 15
 // 2. Track a maxDisplayDepth that is user-settable:
 //    maxDepth == currentRoot.depth + maxDisplayDepth
 function D3SymbolTreeMap(mapWidth, mapHeight, levelsToShow) {
   this._mapContainer = undefined;
@@ skipping 16 matching lines @@
   this._currentNodes = undefined;
   this._treeData = undefined;
   this._maxLevelsToShow = levelsToShow;
   this._currentMaxDepth = this._maxLevelsToShow;
 }
 
 /**
  * Make a number pretty, with comma separators.
  */
 D3SymbolTreeMap._pretty = function(num) {
+  num = Math.round(num)
   var asString = String(num);
   var result = '';
   var counter = 0;
   for (var x = asString.length - 1; x >= 0; x--) {
     counter++;
     if (counter === 4) {
       result = ',' + result;
       counter = 1;
     }
     result = asString.charAt(x) + result;
@@ skipping 855 matching lines @@
     if (datum.value > smallest) { // array is already full
       result.push(datum);
       result.sort(sortFunction);
       result.pop(); // get rid of smallest element
       smallest = result[maxRecords - 1].value; // new threshold for entry
     }
   });
   result.sort(sortFunction);
   return result;
 }