DevTools: support resolving a UILocation to multiple raw script locations

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 327 matching lines @@
     var entry = mappings[first];
     if (!first && entry &&
         (lineNumber < entry.lineNumber || (lineNumber === entry.lineNumber && columnNumber < entry.columnNumber)))
       return null;
     return entry;
   }
 
   /**
    * @param {string} sourceURL
    * @param {number} lineNumber
-   * @return {?SDK.SourceMapEntry}
+   * @return {!Array<!SDK.SourceMapEntry>}
    */
-  firstSourceLineMapping(sourceURL, lineNumber) {
+  mappingsForLine(sourceURL, lineNumber) {
     var mappings = this._reversedMappings(sourceURL);
-    var index = mappings.lowerBound(lineNumber, lineComparator);
-    if (index >= mappings.length || mappings[index].sourceLineNumber !== lineNumber)
-      return null;
-    return mappings[index];
-
-    /**
-     * @param {number} lineNumber
-     * @param {!SDK.SourceMapEntry} mapping
-     * @return {number}
-     */
-    function lineComparator(lineNumber, mapping) {
-      return lineNumber - mapping.sourceLineNumber;
-    }
+    var startIndex = mappings.lowerBound(lineNumber, (lineNumber, mapping) => lineNumber - mapping.sourceLineNumber);
+    var endIndex = startIndex;
+    while (endIndex < mappings.length && mappings[endIndex].sourceLineNumber === lineNumber)
+      ++endIndex;
+    return mappings.slice(startIndex, endIndex);
   }
 
   /**
    * @return {!Array<!SDK.SourceMapEntry>}
    */
   mappings() {
     if (this._mappings === null) {
       this._mappings = [];
       this._eachSection(this._parseMap.bind(this));
       this._json = null;
@@ skipping 227 matching lines @@
    * @param {?string} content
    * @param {?Array<!SDK.SourceMapEntry>} reverseMappings
    */
   constructor(content, reverseMappings) {
     this.content = content;
     this.reverseMappings = reverseMappings;
   }
 };
 
 SDK.TextSourceMap._sourcesListSymbol = Symbol('sourcesList');