cc: Create a Region class that wraps SkRegion, to replace use of WebCore::Region.

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_tests_source_files': [
       'active_animation_unittest.cc',
       'content_layer_unittest.cc',
@@ skipping 16 matching lines @@
       'layer_tree_host_common_unittest.cc',
       'layer_tree_host_impl_unittest.cc',
       'layer_tree_host_unittest.cc',
       'layer_unittest.cc',
       'math_util_unittest.cc',
       'nine_patch_layer_impl_unittest.cc',
       'nine_patch_layer_unittest.cc',
       'occlusion_tracker_unittest.cc',
       'prioritized_resource_unittest.cc',
       'quad_culler_unittest.cc',
+      'region_unittest.cc',
       'render_pass_unittest.cc',
       'render_surface_filters_unittest.cc',
       'render_surface_unittest.cc',
       'resource_provider_unittest.cc',
       'resource_update_controller_unittest.cc',
       'scheduler_state_machine_unittest.cc',
       'scheduler_unittest.cc',
       'scoped_texture_unittest.cc',
       'scrollbar_animation_controller_linear_fade_unittest.cc',
       'scrollbar_layer_unittest.cc',
@@ skipping 108 matching lines @@
           'variables': {
             'test_suite_name': 'cc_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)cc_unittests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }