Attempt 3 at:

ui/gfx/compositor/compositor.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'target_defaults': {
     'sources/': [
@@ skipping 24 matching lines @@
       ],
       'sources': [
         'compositor.cc',
         'compositor.h',
         'compositor_export.h',
         'compositor_gl.cc',
         'compositor_gl.h',
         'compositor_cc.cc',
         'compositor_cc.h',
         'compositor_observer.h',
+        'compositor_setup.h',
         'compositor_stub.cc',
         'compositor_switches.cc',
         'compositor_switches.h',
         'compositor_win.cc',
         'debug_utils.cc',
         'debug_utils.h',
         'layer.cc',
         'layer.h',
         'layer_animation_delegate.h',
         'layer_animation_element.cc',
@@ skipping 45 matching lines @@
             'dependencies': [
               '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
               '<(DEPTH)/webkit/support/webkit_support.gyp:fileapi',
               '<(DEPTH)/webkit/support/webkit_support.gyp:glue',
               '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_gpu',
             ],
           }, {
             'sources!': [
               'compositor_cc.cc',
               'compositor_cc.h',
+              'compositor_setup.h',
               'test_web_graphics_context_3d.cc',
               'test_web_graphics_context_3d.h',
             ],
           }
         ],
       ],
     },
     {
       'target_name': 'compositor_test_support',
       'type': 'static_library',
@@ skipping 30 matching lines @@
         '<(DEPTH)/base/base.gyp:test_support_base',
         '<(DEPTH)/chrome/chrome_resources.gyp:packed_resources',
         '<(DEPTH)/skia/skia.gyp:skia',
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/ui/gfx/gl/gl.gyp:gl',
         '<(DEPTH)/ui/ui.gyp:gfx_resources',
         '<(DEPTH)/ui/ui.gyp:ui',
         '<(DEPTH)/ui/ui.gyp:ui_resources',
         'compositor',
         'compositor_test_support',
-        'test_compositor',
       ],
       'sources': [
         'layer_animation_element_unittest.cc',
         'layer_animation_sequence_unittest.cc',
         'layer_animator_unittest.cc',
         'layer_unittest.cc',
         'run_all_unittests.cc',
         'test/test_compositor_host.h',
         'test/test_compositor_host_linux.cc',
         'test/test_compositor_host_mac.mm',
         'test/test_compositor_host_win.cc',
         'test/test_layer_animation_delegate.cc',
         'test/test_layer_animation_delegate.h',
         'test/test_layer_animation_observer.cc',
         'test/test_layer_animation_observer.h',
         'test/test_suite.cc',
         'test/test_suite.h',
         'test/test_utils.cc',
         'test/test_utils.h',
         '<(SHARED_INTERMEDIATE_DIR)/ui/gfx/gfx_resources.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
       ],
       'conditions': [
         # osmesa GL implementation is used on linux.
         ['OS=="linux"', {
           'dependencies': [
             '<(DEPTH)/third_party/mesa/mesa.gyp:osmesa',
           ],
         }],
+        ['use_webkit_compositor==0', {
+          'dependencies': [
+            'test_compositor',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'test_compositor',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
       ],
       'sources': [
         '../test/gfx_test_utils.cc',
@@ skipping 11 matching lines @@
             'test/test_compositor.cc',
             'test/test_compositor.h',
             'test/test_texture.cc',
             'test/test_texture.h',
           ],
         }],
       ],
     },
   ],
 }