third_party/WebKit/LayoutTests/inspector-protocol/memory/sampling-native-snapshot.js

(async function(testRunner) {
  var {page, session, dp} = await testRunner.startBlank(`Test sampling native memory snapshot.`);

  // --sampling-heap-profiler enables sampling with interval 128KiB
  // Maximum interval afterval after randomization is 20x, which is 2560KiB.
  // That corresponds to a canvas of size 640x1024 with 32bits per pixel.
  await session.evaluate(`
    const canvas = document.createElement('canvas');
    canvas.width = 640;
    canvas.height = 1024;
    const ctx = canvas.getContext('2d');
    ctx.fillStyle = 'green';
    ctx.fillRect(0, 0, 10, 10);
    document.body.appendChild(canvas);
    `);
  const message = await dp.Memory.getAllTimeSamplingProfile();

  const profile = message.result.profile;
  const foundTheSample = profile.samples.some(sample =>
    sample.size >= 640 * 1024 && sample.stack.some(frame => frame.includes('HTMLCanvasElement')));
  testRunner.log('Found sample: ' + foundTheSample);

  testRunner.completeTest();
})