DevTools: sort sourceMap mappings since they might not be ordered.

third_party/WebKit/Source/devtools/front_end/sdk/SourceMap.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 65 matching lines @@
    * @param {string=} name
    */
   constructor(lineNumber, columnNumber, sourceURL, sourceLineNumber, sourceColumnNumber, name) {
     this.lineNumber = lineNumber;
     this.columnNumber = columnNumber;
     this.sourceURL = sourceURL;
     this.sourceLineNumber = sourceLineNumber;
     this.sourceColumnNumber = sourceColumnNumber;
     this.name = name;
   }
+
+  /**
+   * @param {!SDK.SourceMapEntry} entry1
+   * @param {!SDK.SourceMapEntry} entry2
+   * @return {number}
+   */
+  static compare(entry1, entry2) {
+    if (entry1.lineNumber !== entry2.lineNumber)
+      return entry1.lineNumber - entry2.lineNumber;
+    return entry1.columnNumber - entry2.columnNumber;
+  }
 };
 
 /**
  * @interface
  */
 SDK.SourceMap = function() {};
 
 SDK.SourceMap.prototype = {
   /**
    * @return {string}
@@ skipping 378 matching lines @@
       if (!stringCharIterator.hasNext() || this._isSeparator(stringCharIterator.peek())) {
         this._mappings.push(
             new SDK.SourceMapEntry(lineNumber, columnNumber, sourceURL, sourceLineNumber, sourceColumnNumber));
         continue;
       }
 
       nameIndex += this._decodeVLQ(stringCharIterator);
       this._mappings.push(new SDK.SourceMapEntry(
           lineNumber, columnNumber, sourceURL, sourceLineNumber, sourceColumnNumber, names[nameIndex]));
     }
+
+    // As per spec, mappings are not necessarily sorted.
+    this._mappings.stableSort(SDK.SourceMapEntry.compare);
   }
 
   /**
    * @param {string} char
    * @return {boolean}
    */
   _isSeparator(char) {
     return char === ',' || char === ';';
   }
 
@@ skipping 94 matching lines @@
    * @param {?string} content
    * @param {?Array<!SDK.SourceMapEntry>} reverseMappings
    */
   constructor(content, reverseMappings) {
     this.content = content;
     this.reverseMappings = reverseMappings;
   }
 };
 
 SDK.TextSourceMap._sourcesListSymbol = Symbol('sourcesList');