DevTools: support sourceMappingURL for the inline stylesheets

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @implements {Common.ContentProvider}
  * @unrestricted
  */
 SDK.CSSStyleSheetHeader = class {
   /**
    * @param {!SDK.CSSModel} cssModel
@@ skipping 45 matching lines @@
   }
 
   /**
    * @return {!SDK.CSSModel}
    */
   cssModel() {
     return this._cssModel;
   }
 
   /**
+   * @return {boolean}
+   */
+  isAnonymousInlineStyleSheet() {
+    return !this.resourceURL() && !this._cssModel.sourceMapForHeader(this);
+  }
+
+  /**
    * @return {string}
    */
   resourceURL() {
     return this.isViaInspector() ? this._viaInspectorResourceURL() : this.sourceURL;
   }
 
   /**
    * @return {string}
    */
   _viaInspectorResourceURL() {
@@ skipping 122 matching lines @@
      */
     function performSearch(content) {
       var searchResults =
           content ? Common.ContentProvider.performSearchInContent(content, query, caseSensitive, isRegex) : [];
       callback(searchResults);
     }
 
     this.requestContent().then(performSearch);
   }
 };