chromium/chrome/browser/resources/lens/overlay/overlay_shimmer.html

<style>
  :host {
    height: 100%;
    width: 100%;
  }

  #sparkleContainer {
    height: 100%;
    width: 100%;
  }

  :host([enable-sparkles]) #sparkleContainer {
    filter: url(#sparkles);
  }

  svg {
    display: none;
  }
</style>
<div id="sparkleContainer">
  <template id="circlesContainer" is="dom-repeat" items="[[circles]]"
      as="circle">
    <shimmer-circle color-hex="[[circle.colorHex]]"
        steady-state-center-x="[[circle.steadyStateCenterX]]"
        steady-state-center-y="[[circle.steadyStateCenterY]]"
        is-steady-state$="[[isSteadyState]]"
        is-wiggling$="[[isWiggling]]"></shimmer-circle>
  </template>
</div>

<svg id="filterSvg" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="sparkles" color-interpolation-filters="auto">
      <feTurbulence id="turbulance" baseFrequency="0.5" numOctaves="4"
          seed$="[[sparkleSeed]]"></feTurbulence>
      <feColorMatrix values="
        0 0 0 1 -.4
        0 0 0 1 -.3
        0 0 0 1 -.5
        0 0 0 0 1"></feColorMatrix>
      <feColorMatrix values="
        0 0 0 0 1
        0 0 0 0 1
        0 0 0 0 1
        1 1 1 0 0" result="grain"></feColorMatrix>
      <feComposite in="colormatrix2" in2="SourceGraphic" operator="atop">
      </feComposite>
    </filter>
  </defs>
</svg>