Timeline: fix a bunch of references to out-of-file privates

third_party/WebKit/Source/devtools/front_end/ui_lazy/TimelineOverviewPane.js

 /*
  * Copyright (C) 2013 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 474 matching lines @@
  */
 UI.TimelineOverviewBase = class extends UI.VBox {
   constructor() {
     super();
     /** @type {?UI.TimelineOverviewCalculator} */
     this._calculator = null;
     this._canvas = this.element.createChild('canvas', 'fill');
     this._context = this._canvas.getContext('2d');
   }
 
+  /** @return {number} */
+  width() {
+    return this._canvas.width;
+  }
+
+  /** @return {number} */
+  height() {
+    return this._canvas.height;
+  }
+
+  /** @return {!CanvasRenderingContext2D} */
+  context() {
+    return this._context;
+  }
+
   /**
    * @override
    */
   update() {
     this.resetCanvas();
   }
 
   /**
    * @override
    */
@@ skipping 70 matching lines @@
       left: haveRecords && startTime ? Math.min((startTime - absoluteMin) / timeSpan, 1) : 0,
       right: haveRecords && endTime < Infinity ? (endTime - absoluteMin) / timeSpan : 1
     };
   }
 
   resetCanvas() {
     this._canvas.width = this.element.clientWidth * window.devicePixelRatio;
     this._canvas.height = this.element.clientHeight * window.devicePixelRatio;
   }
 };