Turn on verbose flag for compiling file_manager.

ui/file_manager/file_manager/foreground/js/compiled_resources.gyp

Index: ui/file_manager/file_manager/foreground/js/compiled_resources.gyp
diff --git a/ui/file_manager/file_manager/foreground/js/compiled_resources.gyp b/ui/file_manager/file_manager/foreground/js/compiled_resources.gyp
index 4038e20b67302015107ff86e488ef2846359e88a..92b862f3acc6d0e6bc349120b93b89a34cbbd395 100644
--- a/ui/file_manager/file_manager/foreground/js/compiled_resources.gyp
+++ b/ui/file_manager/file_manager/foreground/js/compiled_resources.gyp
@@ -62,9 +62,9 @@
           '../../background/js/app_window_wrapper.js',
           '../../background/js/import_history.js',
           '../../background/js/launcher_search.js',
+          '../../background/js/task_queue.js',
           '../../background/js/media_import_handler.js',
           '../../background/js/media_scanner.js',
-          '../../background/js/task_queue.js',
           '../../background/js/background_base.js',
           '../../background/js/background.js',
           '../../../image_loader/image_loader_client.js',
@@ -164,6 +164,9 @@
           '../../../externs/platform.js',
           '../../common/js/externs.js',
         ],
+        'closure_args': [
+          'warning_level=VERBOSE'
+        ]
       },
       'includes': [
         '../../../../../components/chrome_apps/webstore_widget/cws_widget/compiled_resources.gypi',