Files.app: allow stretching thumbnails in file list.

BUG=453704
TEST=place small image on Drive and Downloads, and check if the thumbnail box/circle
is filled in grid view and list view.

Review URL: https://codereview.chromium.org/904393003

Cr-Commit-Position: refs/heads/master@{#315294}

ui/file_manager/file_manager/foreground/css/file_manager.css

@@ -1219,6 +1219,11 @@ li[renaming=''] .filename-label {
   width: 28px;
 }
 
+#list-container list li .detail-thumbnail > img {
+  -webkit-user-drag: none;
+  position: absolute;
+}
+
 #list-container list li:not([selected]) .detail-thumbnail.loaded {
   opacity: 1;
 }

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

@@ -105,7 +105,7 @@ FileGrid.prototype.updateListItemsMetadata = function(type, entries) {
                                   this.metadataCache_,
                                   this.volumeManager_,
                                   this.historyLoader_,
-                                  ThumbnailLoader.FillMode.FILL,
+                                  ThumbnailLoader.FillMode.OVER_FILL,
                                   FileGrid.ThumbnailQuality.LOW,
                                   /* animation */ false);
   }
@@ -181,7 +181,7 @@ FileGrid.decorateThumbnail = function(
         metadataCache,
         volumeManager,
         historyLoader,
-        ThumbnailLoader.FillMode.FILL,
+        ThumbnailLoader.FillMode.OVER_FILL,
         FileGrid.ThumbnailQuality.LOW,
         /* animation */ !previousBox);
   }

ui/file_manager/file_manager/foreground/js/ui/file_table.js

@@ -805,7 +805,7 @@ FileTable.prototype.renderThumbnail_ = function(entry) {
         function(metadata) {
           var loader = new ThumbnailLoader(
               entry, ThumbnailLoader.LoaderType.IMAGE, metadata);
-          loader.load(box, ThumbnailLoader.FillMode.FILL,
+          loader.load(box, ThumbnailLoader.FillMode.OVER_FILL,
                       ThumbnailLoader.OptimizationMode.DISCARD_DETACHED,
                       function(image, transform) {
                         box.classList.add('loaded');