DevTools: Create extensible QuickOpen control

third_party/WebKit/Source/devtools/front_end/sources/FilteredUISourceCodeListProvider.js

Index: third_party/WebKit/Source/devtools/front_end/sources/FilteredUISourceCodeListProvider.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/FilteredUISourceCodeListProvider.js b/third_party/WebKit/Source/devtools/front_end/sources/FilteredUISourceCodeListProvider.js
index e16ddcdb2d6d45f9477adf9391ee7c6f4784d177..c8b54ca2e07c1a5a413e8ae2df2e35afac692251 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/FilteredUISourceCodeListProvider.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/FilteredUISourceCodeListProvider.js
@@ -9,12 +9,12 @@
  */
 Sources.FilteredUISourceCodeListProvider = class extends QuickOpen.FilteredListWidget.Provider {
   /**
-   * @param {!Map.<!Workspace.UISourceCode, number>=} defaultScores
+   * @param {?Map.<!Workspace.UISourceCode, number>=} defaultScores
    */
   constructor(defaultScores) {
     super();
 
-    this._defaultScores = defaultScores;
+    this._defaultScores = defaultScores || null;
     this._scorer = new Sources.FilePathScoreFunction('');
   }
 
@@ -87,6 +87,14 @@ Sources.FilteredUISourceCodeListProvider = class extends QuickOpen.FilteredListW
   }
 
   /**
+   * @protected
+   * @param {?Map.<!Workspace.UISourceCode, number>} defaultScores
+   */
+  setDefaultScores(defaultScores) {
+    this._defaultScores = defaultScores;
+  }
+
+  /**
    * @override
    * @param {number} itemIndex
    * @param {string} query