compositor-worker: Introduce WebCompositorMutableState

cc/blink/cc_blink.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': [
     {
       # GN version: //cc/blink
       'target_name': 'cc_blink',
       'type': '<(component)',
@@ skipping 41 matching lines @@
         'web_filter_operations_impl.cc',
         'web_filter_operations_impl.h',
         'web_float_animation_curve_impl.cc',
         'web_float_animation_curve_impl.h',
         'web_image_layer_impl.cc',
         'web_image_layer_impl.h',
         'web_layer_impl.cc',
         'web_layer_impl.h',
         'web_layer_impl_fixed_bounds.cc',
         'web_layer_impl_fixed_bounds.h',
+        'web_mutable_state_impl.cc',
+        'web_mutable_state_impl.h',
         'web_scroll_offset_animation_curve_impl.cc',
         'web_scroll_offset_animation_curve_impl.h',
         'web_scrollbar_layer_impl.cc',
         'web_scrollbar_layer_impl.h',
         'web_to_cc_animation_delegate_adapter.cc',
         'web_to_cc_animation_delegate_adapter.h',
         'web_transform_animation_curve_impl.cc',
         'web_transform_animation_curve_impl.h',
         'web_transform_operations_impl.cc',
         'web_transform_operations_impl.h',
       ],
     },
   ]
 }