DevTools: introduce uiSourceCode.mimeType() method

third_party/WebKit/Source/devtools/front_end/bindings/SASSSourceMapping.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 55 matching lines @@
     var header = /** @type {!SDK.CSSStyleSheetHeader} */ (event.data.client);
     var sourceMap = /** @type {!SDK.SourceMap} */ (event.data.sourceMap);
     for (var sassURL of sourceMap.sourceURLs()) {
       var uiSourceCode = this._project.uiSourceCodeForURL(sassURL);
       if (uiSourceCode) {
         Bindings.NetworkProject.addFrameAttribution(uiSourceCode, header.frameId);
         continue;
       }
 
       var contentProvider = sourceMap.sourceContentProvider(sassURL, Common.resourceTypes.SourceMapStyleSheet);
+      var mimeType = Common.ResourceType.mimeFromURL(sassURL) || contentProvider.contentType().canonicalMimeType();
       var embeddedContent = sourceMap.embeddedContentByURL(sassURL);
       var metadata =
           typeof embeddedContent === 'string' ? new Workspace.UISourceCodeMetadata(null, embeddedContent.length) : null;
       uiSourceCode = this._project.createUISourceCode(sassURL, contentProvider.contentType());
       Bindings.NetworkProject.setInitialFrameAttribution(uiSourceCode, header.frameId);
       uiSourceCode[Bindings.SASSSourceMapping._sourceMapSymbol] = sourceMap;
-      this._project.addUISourceCodeWithProvider(uiSourceCode, contentProvider, metadata);
+      this._project.addUISourceCodeWithProvider(uiSourceCode, contentProvider, metadata, mimeType);
     }
     Bindings.cssWorkspaceBinding.updateLocations(header);
     this._sourceMapAttachedForTest(sourceMap);
   }
 
   /**
    * @param {!Common.Event} event
    */
   _sourceMapDetached(event) {
     var header = /** @type {!SDK.CSSStyleSheetHeader} */ (event.data.client);
@@ skipping 68 matching lines @@
     return locations;
   }
 
   dispose() {
     this._project.dispose();
     Common.EventTarget.removeEventListeners(this._eventListeners);
   }
 };
 
 Bindings.SASSSourceMapping._sourceMapSymbol = Symbol('sourceMap');