Files.app: Stop to use drive thumbnail for cached files.

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

Index: ui/file_manager/file_manager/foreground/js/ui/file_grid.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/file_grid.js b/ui/file_manager/file_manager/foreground/js/ui/file_grid.js
index 8c0983325b62fc585cac77be424be0af3f0611b3..a7983a6babcf727b6c1a6b72ce0dd4c03b323259 100644
--- a/ui/file_manager/file_manager/foreground/js/ui/file_grid.js
+++ b/ui/file_manager/file_manager/foreground/js/ui/file_grid.js
@@ -240,19 +240,22 @@ FileGrid.decorateThumbnailBox = function(
 
   var metadataTypes = 'thumbnail|filesystem|external|media';
 
-  // Drive provides high quality thumbnails via USE_EMBEDDED, however local
-  // images usually provide very tiny thumbnails, therefore USE_EMBEDDE can't
-  // be used to obtain high quality output.
-  var useEmbedded;
+  // CONTENT_METADATA contains usually very tiny thumbnails. So use it only for
+  // ThumbnailQuality.LOW.
+  var loadTargets;
   switch (quality) {
     case FileGrid.ThumbnailQuality.LOW:
-      useEmbedded = ThumbnailLoader.UseEmbedded.USE_EMBEDDED;
+      loadTargets = [
+        ThumbnailLoader.LoadTarget.CONTENT_METADATA,
+        ThumbnailLoader.LoadTarget.EXTERNAL_METADATA,
+        ThumbnailLoader.LoadTarget.FILE_ENTRY
+      ];
       break;
     case FileGrid.ThumbnailQuality.HIGH:
-      // TODO(mtomasz): Use Entry instead of paths.
-      useEmbedded = (locationInfo && locationInfo.isDriveBased) ?
-          ThumbnailLoader.UseEmbedded.USE_EMBEDDED :
-          ThumbnailLoader.UseEmbedded.NO_EMBEDDED;
+      loadTargets = [
+        ThumbnailLoader.LoadTarget.EXTERNAL_METADATA,
+        ThumbnailLoader.LoadTarget.FILE_ENTRY
+      ];
       break;
   }
 
@@ -262,7 +265,7 @@ FileGrid.decorateThumbnailBox = function(
                             ThumbnailLoader.LoaderType.IMAGE,
                             metadata,
                             undefined,  // opt_mediaType
-                            useEmbedded).
+                            loadTargets).
             load(box,
                 fillMode,
                 ThumbnailLoader.OptimizationMode.DISCARD_DETACHED,