Support bottom-right anchored fixed-position elements during a pinch gesture

cc/cc.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': 1,
     'cc_source_files': [
       'animation/animation.cc',
       'animation/animation.h',
@@ skipping 92 matching lines @@
       'animation/layer_animation_controller.cc',
       'animation/layer_animation_controller.h',
       'animation/layer_animation_event_observer.h',
       'animation/layer_animation_value_observer.h',
       'layers/layer_impl.cc',
       'layers/layer_impl.h',
       'layers/layer_iterator.cc',
       'layers/layer_iterator.h',
       'layers/layer_lists.h',
       'resources/layer_painter.h',
+      'layers/layer_position_constraint.cc',
+      'layers/layer_position_constraint.h',
       'resources/layer_quad.cc',
       'resources/layer_quad.h',
       'trees/layer_sorter.cc',
       'trees/layer_sorter.h',
       'resources/layer_tiling_data.cc',
       'resources/layer_tiling_data.h',
       'debug/layer_tree_debug_state.cc',
       'debug/layer_tree_debug_state.h',
       'trees/layer_tree_host.cc',
       'trees/layer_tree_host.h',
@@ skipping 252 matching lines @@
         'CC_IMPLEMENTATION=1',
       ],
       'sources': [
         '<@(cc_source_files)',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }