This is UI side unreadable device support.

chrome/browser/ui/webui/fileicon_source_cros.cc

Index: chrome/browser/ui/webui/fileicon_source_cros.cc
diff --git a/chrome/browser/ui/webui/fileicon_source_cros.cc b/chrome/browser/ui/webui/fileicon_source_cros.cc
index 3540acb9120a7ec6fc94cb0f59af28390fe524de..aa17e9babb45567e21344f3cd504a107cbfb605f 100644
--- a/chrome/browser/ui/webui/fileicon_source_cros.cc
+++ b/chrome/browser/ui/webui/fileicon_source_cros.cc
@@ -52,6 +52,11 @@ const IdrBySize kAudioIdrs = {
   IDR_FILE_MANAGER_IMG_FILETYPE_LARGE_AUDIO,
   IDR_FILE_MANAGER_IMG_FILETYPE_LARGE_AUDIO
 };
+const IdrBySize kDeviceIdrs = {
+  IDR_FILE_MANAGER_IMG_FILETYPE_DEVICE,
+  IDR_FILE_MANAGER_IMG_FILETYPE_DEVICE,
+  IDR_FILE_MANAGER_IMG_FILETYPE_DEVICE
+};
 const IdrBySize kDocIdrs = {
   IDR_FILE_MANAGER_IMG_FILETYPE_DOC,
   IDR_FILE_MANAGER_IMG_FILETYPE_DOC,
@@ -92,6 +97,11 @@ const IdrBySize kSpreadsheetIdrs = {
   IDR_FILE_MANAGER_IMG_FILETYPE_SPREADSHEET,
   IDR_FILE_MANAGER_IMG_FILETYPE_SPREADSHEET
 };
+const IdrBySize kUnreadableDeviceIdrs = {
+  IDR_FILE_MANAGER_IMG_FILETYPE_UNREADABLE_DEVICE,
+  IDR_FILE_MANAGER_IMG_FILETYPE_UNREADABLE_DEVICE,
+  IDR_FILE_MANAGER_IMG_FILETYPE_UNREADABLE_DEVICE
+};
 const IdrBySize kTextIdrs = {
   IDR_FILE_MANAGER_IMG_FILETYPE_TEXT,
   IDR_FILE_MANAGER_IMG_FILETYPE_TEXT,