Use special icon for shared folders in file list.

ui/file_manager/file_manager/foreground/js/file_grid.js

Index: ui/file_manager/file_manager/foreground/js/file_grid.js
diff --git a/ui/file_manager/file_manager/foreground/js/file_grid.js b/ui/file_manager/file_manager/foreground/js/file_grid.js
index d705827811a73644abc0f621b0727e73305346ff..d3ea59fc26d1df2ec6f711a01ad389d42102e5a2 100644
--- a/ui/file_manager/file_manager/foreground/js/file_grid.js
+++ b/ui/file_manager/file_manager/foreground/js/file_grid.js
@@ -146,9 +146,17 @@ FileGrid.decorateThumbnail = function(li, entry, metadataCache, volumeManager) {
 FileGrid.decorateThumbnailBox = function(
     box, entry, metadataCache, volumeManager, fillMode, quality,
     opt_imageLoadCallback) {
+  var locationInfo = volumeManager.getLocationInfo(entry);
   box.className = 'img-container';
+
   if (entry.isDirectory) {
     box.setAttribute('generic-thumbnail', 'folder');
+    if (locationInfo && locationInfo.isDriveBased) {
+      metadataCache.get(entry, 'drive', function(metadata) {
+        if (metadata.shared)
+          box.classList.add('shared');
+      });
+    }
     if (opt_imageLoadCallback)
       setTimeout(opt_imageLoadCallback, 0, null /* callback parameter */);
     return;
@@ -156,7 +164,6 @@ FileGrid.decorateThumbnailBox = function(
 
   var metadataTypes = 'thumbnail|filesystem';
 
-  var locationInfo = volumeManager.getLocationInfo(entry);
   if (locationInfo && locationInfo.isDriveBased) {
     metadataTypes += '|drive';
   } else {