DevTools: inline SourceMaps should report data url as their url.

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 185 matching lines @@
     if (!SDK.TextSourceMap._base64Map) {
       const base64Digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
       SDK.TextSourceMap._base64Map = {};
       for (var i = 0; i < base64Digits.length; ++i)
         SDK.TextSourceMap._base64Map[base64Digits.charAt(i)] = i;
     }
 
     this._json = payload;
     this._compiledURL = compiledURL;
     this._sourceMappingURL = sourceMappingURL;
+    this._baseURL = sourceMappingURL.startsWith('data:') ? compiledURL : sourceMappingURL;
+
     /** @type {?Array<!SDK.SourceMapEntry>} */
     this._mappings = null;
     /** @type {!Map<string, !SDK.TextSourceMap.SourceInfo>} */
     this._sourceInfos = new Map();
     this._eachSection(this._parseSources.bind(this));
   }
 
   /**
    * @param {string} sourceMapURL
    * @param {string} compiledURL
@@ skipping 14 matching lines @@
     function contentLoaded(statusCode, headers, content) {
       if (!content || statusCode >= 400) {
         callback(null);
         return;
       }
 
       if (content.slice(0, 3) === ')]}')
         content = content.substring(content.indexOf('\n'));
       try {
         var payload = /** @type {!SDK.SourceMapV3} */ (JSON.parse(content));
-        var baseURL = sourceMapURL.startsWith('data:') ? compiledURL : sourceMapURL;
-        callback(new SDK.TextSourceMap(compiledURL, baseURL, payload));
+        callback(new SDK.TextSourceMap(compiledURL, sourceMapURL, payload));
       } catch (e) {
         console.error(e);
         Common.console.warn('DevTools failed to parse SourceMap: ' + sourceMapURL);
         callback(null);
       }
     }
   }
 
   /**
    * @override
@@ skipping 173 matching lines @@
   /**
    * @param {!SDK.SourceMapV3} sourceMap
    */
   _parseSources(sourceMap) {
     var sourcesList = [];
     var sourceRoot = sourceMap.sourceRoot || '';
     if (sourceRoot && !sourceRoot.endsWith('/'))
       sourceRoot += '/';
     for (var i = 0; i < sourceMap.sources.length; ++i) {
       var href = sourceRoot + sourceMap.sources[i];
-      var url = Common.ParsedURL.completeURL(this._sourceMappingURL, href) || href;
+      var url = Common.ParsedURL.completeURL(this._baseURL, href) || href;
       var source = sourceMap.sourcesContent && sourceMap.sourcesContent[i];
       if (url === this._compiledURL && source)
         url += Common.UIString('? [sm]');
       this._sourceInfos.set(url, new SDK.TextSourceMap.SourceInfo(source, null));
       sourcesList.push(url);
     }
     sourceMap[SDK.TextSourceMap._sourcesListSymbol] = sourcesList;
   }
 
   /**
@@ skipping 158 matching lines @@
    * @param {?string} content
    * @param {?Array<!SDK.SourceMapEntry>} reverseMappings
    */
   constructor(content, reverseMappings) {
     this.content = content;
     this.reverseMappings = reverseMappings;
   }
 };
 
 SDK.TextSourceMap._sourcesListSymbol = Symbol('sourcesList');