static _preloadChromeExtensionsToCache(entityCache, devtoolsLog) {
    for (const entry of devtoolsLog.values()) {
      if (entry.method !== 'Runtime.executionContextCreated') continue;

      const origin = entry.params.context.origin;
      if (!origin.startsWith('chrome-extension:')) continue;
      if (entityCache.has(origin)) continue;

      EntityClassification.makeupChromeExtensionEntity_(entityCache, origin,
        entry.params.context.name);
    }
  }
Preload Chrome extensions found in the devtoolsLog into cache.
@param {EntityCache} entityCache
@param {LH.DevtoolsLog} devtoolsLog