Method build

src/service/resource.js:323–342

* Requests the resource's element to be built. See AmpElement.build * for details. * @return {?Promise}

()

   * @return {?Promise}
   */
  build() {
    if (this.isBuilding_ || !this.element.isUpgraded()) {
      return null;
    }
    this.isBuilding_ = true;
    return this.element.buildInternal().then(
      () => {
        this.isBuilding_ = false;
        this.state_ = ResourceState_Enum.NOT_LAID_OUT;
        // TODO(dvoytenko): merge with the standard BUILT signal.
        this.element.signals().signal('res-built');
      },
      (reason) => {
        this.maybeReportErrorOnBuildFailure(reason);
        this.isBuilding_ = false;
        this.element.signals().rejectSignal('res-built', reason);
        throw reason;
      }
    );
  }

  /**
   * @param {*} reason