chromium/tools/perf/page_sets/tough_canvas_cases/canvas2d_balls_common/bouncing_balls_draw_back_as_image.js

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var backImage;

function prepareBackground() {
  backImage = document.getElementById('backImage');
}

function drawBackground() {
  canvasContext.drawImage(backImage, 0, 0, canvasWidth, canvasHeight);
}