Files that are in src/ui/base should be compiled into libui_base.a.

ui/gfx/gl/gl.gyp

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'sources/': [
       ['exclude', '/(cocoa|gtk|win)/'],
       ['exclude', '_(cocoa|gtk|linux|mac|posix|win|x)\\.(cc|mm?)$'],
       ['exclude', '/(gtk|win|x11)_[^/]*\\.cc$'],
@@ skipping 18 matching lines @@
           ['include', '/win/'],
           ['include', '/win_[^/]*\\.cc$'],
       ]}],
     ],
   },
   'targets': [
     {
       'target_name': 'gl',
       'type': 'static_library',
       'dependencies': [
-        '<(DEPTH)/app/app.gyp:app_base',
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/skia/skia.gyp:skia',
+        '<(DEPTH)/ui/ui.gyp:ui_base',
         '<(DEPTH)/ui/ui.gyp:ui_gfx',
       ],
       'variables': {
         'gl_binding_output_dir': '<(SHARED_INTERMEDIATE_DIR)/ui/gfx/gl',
       },
       'include_dirs': [
         '<(DEPTH)/third_party/mesa/MesaLib/include',
         '<(gl_binding_output_dir)',
       ],
       'direct_dependent_settings': {
@@ skipping 121 matching lines @@
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
             ],
           },
         }],
       ],
     },
   ],
 }