Method onMouseDown_

src/input.js:207–214

@private

()

  /** @private */
  onMouseDown_() {
    if (!this.keyboardActive_) {
      return;
    }
    this.keyboardActive_ = false;
    this.keyboardStateObservable_.fire(false);
    dev().fine(TAG_, 'keyboard deactivated');
  }

  /**
   * @param {!Event} e