DevTools: support uiLocationToRawLocations for CSS

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 339 matching lines @@
   mappingsForLine(sourceURL, lineNumber) {
     var mappings = this._reversedMappings(sourceURL);
     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);
   }
 
   /**
+   * @param {string} sourceURL
+   * @param {number} lineNumber
+   * @param {number} columnNumber
+   * @return {?SDK.SourceMapEntry}
+   */
+  findReverseEntry(sourceURL, lineNumber, columnNumber) {

[dgozman, 2017/05/04 00:04:56]

Why this is not similar to JS? Which one is the correct one?

+    var mappings = this._reversedMappings(sourceURL);
+    var index = mappings.lowerBound(
+        [lineNumber, columnNumber],
+        (position, mapping) => position[0] - mapping.sourceLineNumber || position[1] - mapping.sourceColumnNumber);
+    return index < mappings.length ? mappings[index] : null;
+  }
+
+  /**
    * @return {!Array<!SDK.SourceMapEntry>}
    */
   mappings() {
     if (this._mappings === null) {
       this._mappings = [];
       this._eachSection(this._parseMap.bind(this));
       this._json = null;
     }
     return /** @type {!Array<!SDK.SourceMapEntry>} */ (this._mappings);
   }
@@ skipping 224 matching lines @@
    * @param {?string} content
    * @param {?Array<!SDK.SourceMapEntry>} reverseMappings
    */
   constructor(content, reverseMappings) {
     this.content = content;
     this.reverseMappings = reverseMappings;
   }
 };
 
 SDK.TextSourceMap._sourcesListSymbol = Symbol('sourcesList');