Added a link to the downloads tab that opens the downloads folder.

chrome/browser/resources/downloads.html

Index: chrome/browser/resources/downloads.html
diff --git a/chrome/browser/resources/downloads.html b/chrome/browser/resources/downloads.html
index 1bd018753fe76ae455a3caf10d7f0cdf52be0e73..bbee3a2a29b32800eac786d13281a6c890561ba1 100644
--- a/chrome/browser/resources/downloads.html
+++ b/chrome/browser/resources/downloads.html
@@ -53,6 +53,11 @@ html[dir=rtl] .logo, html[dir=rtl] .form {
 
 #downloads-summary > a {
   float: right;
+  margin-left: 10px;
+}
+
+#downloads-summary > a:first-child {
+  margin-left: 0;
 }
 
 html[dir=rtl] #downloads-summary > a {
@@ -203,6 +208,8 @@ html[dir=rtl] .progress {
 <div class="main">
   <div id="downloads-summary">
     <span id="downloads-summary-text" i18n-content="downloads">Downloads</span>
+    <a id="open-downloads-folder" href=""
+       i18n-content="open_downloads_folder">Open downloads folder</a>
     <a id="clear-all" href="" i18n-content="clear_all">Clear All</a>
   </div>
   <div id="downloads-display"></div>