Compile several targets in Gallery in gyp v2.

ui/file_manager/gallery/js/gallery_item_unittest.js

Index: ui/file_manager/gallery/js/gallery_item_unittest.js
diff --git a/ui/file_manager/gallery/js/gallery_item_unittest.js b/ui/file_manager/gallery/js/gallery_item_unittest.js
index 8ce4bfff8d9138c56b4c8f5d9081ee3cf12c6798..a96d9335ff3652b815285ad4b5a9566788c152a7 100644
--- a/ui/file_manager/gallery/js/gallery_item_unittest.js
+++ b/ui/file_manager/gallery/js/gallery_item_unittest.js
@@ -3,15 +3,15 @@
 // found in the LICENSE file.
 
 /**
- * Mock of ImageUtil.
+ * Mock of ImageUtil and metrics.
  */
 var ImageUtil = {
   getMetricName: function() {},
-  metrics: {
-    recordEnum: function() {},
-    recordInterval: function() {},
-    startInterval: function() {}
-  }
+};
+var metrics = {
+  recordEnum: function() {},
+  recordInterval: function() {},
+  startInterval: function() {}
 };
 
 /**