chrome/browser/resources/new_tab_page/modules/module_header.html

<div id="titleContainer">
  <h2 id="title" ?hidden="${!this.headerText}">${this.headerText}</h2>
  <div id="headerSpacer"></div>
  <slot name="title-actions"></slot>
  <cr-icon-button id="menuButton" title="${this.moreActionsText}"
      class="icon-more-vert" @click="${this.onMenuButtonClick_}">
  </cr-icon-button>
</div>

<cr-action-menu id="actionMenu"
    role-description="$i18n{moduleHeaderMoreActionsMenu}">
  ${this.menuItems.map(item => html`
    <button id="${item.action}" class="dropdown-item"
        @click="${this.onButtonClick_}" data-action="${item.action}">
      <cr-icon class="action-menu-icon cr-icon" icon="${item.icon}"></cr-icon>
      ${item.text}
    </button>
  `)}
  ${!this.hideCustomize ? html`
    <hr id="actionMenuDivider" ?hidden="${!this.showDivider_()}">
    <button id="customize-module" class="dropdown-item"
          @click="${this.onButtonClick_}" data-action="customize-module">
    <cr-icon class="action-menu-icon cr-icon" icon="modules:tune"></cr-icon>
        $i18n{modulesCustomizeButtonText}
    </button>
  ` : ''}
</cr-action-menu>