Open cros filemanager when "Open Downloads Folder" is clicked.

chrome/browser/ui/webui/downloads_dom_handler.cc

Index: chrome/browser/ui/webui/downloads_dom_handler.cc
===================================================================
--- chrome/browser/ui/webui/downloads_dom_handler.cc	(revision 108122)
+++ chrome/browser/ui/webui/downloads_dom_handler.cc	(working copy)
@@ -39,6 +39,10 @@
 #include "content/public/browser/browser_thread.h"
 #endif
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/extensions/file_manager_util.h"
+#endif
+
 namespace {
 
 // Maximum number of downloads to show. TODO(glen): Remove this and instead
@@ -357,6 +361,10 @@
 #if defined(OS_MACOSX)
   // Must be called from the UI thread on Mac.
   platform_util::OpenItem(path);
+#elif defined(OS_CHROMEOS)
+  FileManagerUtil::ShowFullTabUrl(
+      Profile::FromBrowserContext(download_manager_->browser_context()),
+      path);
 #else
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,