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diff --git a/chromium/chrome/browser/resources/pdf/elements/viewer-toolbar-dropdown.html b/chromium/chrome/browser/resources/pdf/elements/viewer-toolbar-dropdown.html
new file mode 100644
index 00000000000..1ebf0df604f
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+++ b/chromium/chrome/browser/resources/pdf/elements/viewer-toolbar-dropdown.html
@@ -0,0 +1,109 @@
+<link rel="import" href="chrome://resources/html/polymer.html">
+
+<link rel="import" href="chrome://resources/cr_elements/cr_icon_button/cr_icon_button.html">
+<link rel="import" href="chrome://resources/cr_elements/icons.html">
+<link rel="import" href="chrome://resources/cr_elements/shared_vars_css.html">
+
+<dom-module id="viewer-toolbar-dropdown">
+  <template>
+    <style>
+      :host {
+        display: inline-block;
+        position: relative;
+        text-align: start;
+        --dropdown-width: 260px;
+      }
+
+      :host-context([hidden]) {
+        display: none;
+      }
+
+      :host([dropdown-centered]) {
+        --container-offset: calc(50% - var(--dropdown-width) / 2);
+      }
+
+      #container {
+        position: absolute;
+        right: var(--container-offset, 0);
+      }
+
+      :host-context([dir=rtl]) #container {
+        left: var(--container-offset, 0);
+        right: auto;
+      }
+
+      #dropdown {
+        background-color: var(--cr-menu-background-color);
+        border-radius: 4px;
+        color: var(--cr-primary-text-color);
+        overflow-y: hidden;
+        padding-bottom: 2px;
+        width: var(--dropdown-width);
+      }
+
+      @media (prefers-color-scheme: light) {
+        #dropdown {
+          @apply --shadow-elevation-2dp;
+        }
+      }
+
+      @media (prefers-color-scheme: dark) {
+        #dropdown {
+          background-image: linear-gradient(var(--cr-menu-background-sheen),
+                                            var(--cr-menu-background-sheen));
+          box-shadow: var(--cr-menu-shadow);
+        }
+      }
+
+      #scroll-container {
+        max-height: 300px;
+        overflow-y: auto;
+        padding: 6px 0 4px 0;
+      }
+
+      #button {
+        --cr-icon-button-color: currentColor;
+        --cr-icon-button-height: 32px;
+        --cr-icon-button-icon-start-offset: 4px;
+        --cr-icon-button-width: 48px;
+        margin: 0;
+      }
+
+      #button:hover {
+        background-color: rgba(255, 255, 255, 0.08);
+        opacity: 1;
+      }
+
+      :host([selected]) #button {
+        opacity: 1;
+
+      }
+      :host([dropdown-open]) #button {
+        background-color: rgba(255, 255, 255, 0.24);
+      }
+
+      h1 {
+        border-bottom: var(--cr-separator-line);
+        font-size: 0.87rem;
+        font-weight: 500;
+        margin: 0;
+        padding: 14px 28px;
+      }
+    </style>
+    <cr-icon-button on-click="toggleDropdown" id="button"
+        iron-icon="[[dropdownIcon_]],cr:arrow-drop-down" title$="[[header]]">
+    </cr-icon-button>
+
+    <div id="container">
+      <div id="dropdown" style="display: none">
+        <template is="dom-if" if="[[!hideHeader]]">
+          <h1>{{header}}</h1>
+        </template>
+        <div id="scroll-container">
+          <slot></slot>
+        </div>
+      </div>
+    </div>
+  </template>
+  <script src="viewer-toolbar-dropdown.js"></script>
+</dom-module>