Turn on verbose flag for compiling file_manager.

ui/file_manager/gallery/js/compiled_resources.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'targets': [
     {
       'target_name': 'background',
       'variables': {
         'depends': [
           '../../../../third_party/jstemplate/compiled_resources.gyp:jstemplate',
@@ skipping 20 matching lines @@
           '<(EXTERNS_DIR)/chrome_send.js',
           '<(EXTERNS_DIR)/chrome_extensions.js',
           '<(EXTERNS_DIR)/file_manager_private.js',
           '<(EXTERNS_DIR)/metrics_private.js',
           '../../../../third_party/analytics/externs.js',
           '../../externs/chrome_test.js',
           '../../externs/es6_workaround.js',
           '../../externs/gallery_background.js',
           '../../externs/platform.js',
         ],
+        'closure_args': [
+          'warning_level=VERBOSE',
+        ],
       },
       'includes': [
-        '../../../../third_party/closure_compiler/compile_js.gypi'
+        '../../../../third_party/closure_compiler/compile_js.gypi',
       ],
     },
     {
       'target_name': 'gallery',
       'variables': {
         'depends': [
           '../../../../third_party/jstemplate/compiled_resources.gyp:jstemplate',
           '../../../../third_party/polymer/v1_0/components-chromium/iron-a11y-keys-behavior/iron-a11y-keys-behavior-extracted.js',
           '../../../../third_party/polymer/v1_0/components-chromium/iron-behaviors/iron-button-state-extracted.js',
           '../../../../third_party/polymer/v1_0/components-chromium/iron-behaviors/iron-control-state-extracted.js',
@@ skipping 44 matching lines @@
           '../../file_manager/foreground/js/metadata/multi_metadata_provider.js',
           '../../file_manager/foreground/js/metadata/new_metadata_provider.js',
           '../../file_manager/foreground/js/metadata/thumbnail_model.js',
           '../../file_manager/foreground/js/share_client.js',
           '../../file_manager/foreground/js/thumbnail_loader.js',
           '../../file_manager/foreground/js/ui/file_manager_dialog_base.js',
           '../../file_manager/foreground/js/ui/share_dialog.js',
           '../../file_manager/foreground/js/volume_manager_wrapper.js',
           '../../file_manager/background/js/volume_manager.js',
           '../../image_loader/image_loader_client.js',
+          './image_editor/image_util.js',
+          './image_editor/viewport.js',
+          './image_editor/image_buffer.js',
+          './image_editor/image_view.js',
           './image_editor/commands.js',
+          './image_editor/image_editor.js',
+          './image_editor/image_transform.js',
+          './image_editor/image_adjust.js',
+          './image_editor/filter.js',
+          './image_editor/image_encoder.js',
           './image_editor/exif_encoder.js',
-          './image_editor/filter.js',
-          './image_editor/image_adjust.js',
-          './image_editor/image_buffer.js',
-          './image_editor/image_editor.js',
-          './image_editor/image_encoder.js',
-          './image_editor/image_transform.js',
-          './image_editor/image_util.js',
-          './image_editor/image_view.js',
-          './image_editor/viewport.js',
           './dimmable_ui_controller.js',
           './entry_list_watcher.js',
           './error_banner.js',
           './gallery_data_model.js',
           './gallery_item.js',
           './gallery_util.js',
           './ribbon.js',
           './slide_mode.js',
           './thumbnail_mode.js',
         ],
         'externs': [
           '<(EXTERNS_DIR)/chrome_send.js',
           '<(EXTERNS_DIR)/chrome_extensions.js',
           '<(EXTERNS_DIR)/file_manager_private.js',
           '<(EXTERNS_DIR)/metrics_private.js',
           '../../../../third_party/analytics/externs.js',
           '../../../../third_party/polymer/v1_0/components-chromium/polymer-externs/polymer.externs.js',
           '../../externs/chrome_test.js',
           '../../externs/es6_workaround.js',
           '../../externs/exif_entry.js',
           '../../externs/files_elements.js',
           '../../externs/gallery_foreground.js',
           '../../externs/paper_elements.js',
           '../../externs/platform.js',
           '../../externs/webview_tag.js',
         ],
+        'closure_args': [
+          'warning_level=VERBOSE',
+        ],
       },
       'includes': [
-        '../../../../third_party/closure_compiler/compile_js.gypi'
+        '../../../../third_party/closure_compiler/compile_js.gypi',
       ],
     }
   ],
 }