cc: Don't use partial updates for scrollbars when they are not allowed.

cc/cc_tests.gyp

 # Copyright (c) 2012 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': 0,
     'cc_unit_tests_source_files': [
       'active_animation_unittest.cc',
       'content_layer_unittest.cc',
@@ skipping 64 matching lines @@
       'test/fake_layer_tree_host_client.cc',
       'test/fake_layer_tree_host_client.h',
       'test/fake_layer_tree_host_impl.cc',
       'test/fake_layer_tree_host_impl_client.cc',
       'test/fake_layer_tree_host_impl_client.h',
       'test/fake_layer_tree_host_impl.h',
       'test/fake_picture_layer_tiling_client.cc',
       'test/fake_picture_layer_tiling_client.h',
       'test/fake_proxy.cc',
       'test/fake_proxy.h',
+      'test/fake_scrollbar_layer.cc',
+      'test/fake_scrollbar_layer.h',
       'test/fake_scrollbar_theme_painter.h',
       'test/fake_scrollbar_theme_painter.cc',
       'test/fake_tile_manager_client.h',
       'test/fake_output_surface.cc',
       'test/fake_output_surface.h',
       'test/fake_software_output_device.cc',
       'test/fake_software_output_device.h',
       'test/fake_web_graphics_context_3d.cc',
       'test/fake_web_graphics_context_3d.h',
       'test/fake_web_scrollbar.cc',
@@ skipping 152 matching lines @@
           'variables': {
             'test_suite_name': 'cc_perftests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)cc_perftests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }]
   ],
 }