MD downloads: add a narrow mode for smaller windows

chrome/browser/resources/md_downloads/toolbar.css

Index: chrome/browser/resources/md_downloads/toolbar.css
diff --git a/chrome/browser/resources/md_downloads/toolbar.css b/chrome/browser/resources/md_downloads/toolbar.css
index 61fb89325f641a4861f5d6198d1d896317d4099a..0f00530bb475e7a8dddb38b1970a6d6b39bcc170 100644
--- a/chrome/browser/resources/md_downloads/toolbar.css
+++ b/chrome/browser/resources/md_downloads/toolbar.css
@@ -39,13 +39,39 @@
 
 #search-term {
   --paper-input-container-color: rgba(255, 255, 255, .5);
+  --paper-input-container-focus-color: white;
   --paper-input-container-input: {
     font-size: 14px;
   };
   --paper-input-container-input-color: white;
-  --paper-input-container-focus-color: white;
   --paper-input-container-label: {
     font-size: 14px;
   };
   -webkit-margin-end: 8px;
 }
+
+paper-menu-button {
+  display: none;
+  --paper-menu-button: {
+    padding: 0;
+  };
+}
+
+paper-item {
+  -webkit-user-select: none;
+  cursor: pointer;
+  font: inherit;
+}
+
+paper-item:hover {
+  background: #eaeaea;  /* TODO(dbeam): real color? */
+}
+
+@media all and (max-width: 1024px) {
+  #actions {
+    display: none;
+  }
+  paper-menu-button {
+    display: inline-block;
+  }
+}