Determine mask UVs based on texture size

cc/trees/effect_node.h

 // Copyright 2016 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.
 
 #ifndef CC_TREES_EFFECT_NODE_H_
 #define CC_TREES_EFFECT_NODE_H_
 
 #include "cc/base/filter_operations.h"
 #include "cc/cc_export.h"
 #include "third_party/skia/include/core/SkBlendMode.h"
@@ skipping 23 matching lines @@
   float screen_space_opacity;
 
   FilterOperations filters;
   FilterOperations background_filters;
   gfx::PointF filters_origin;
 
   SkBlendMode blend_mode;
 
   gfx::Vector2dF surface_contents_scale;
 
-  gfx::Size unscaled_mask_target_size;
-
   bool has_render_surface;
   bool has_copy_request;
   bool hidden_by_backface_visibility;
   bool double_sided;
   bool is_drawn;
   // TODO(jaydasika) : Delete this after implementation of
   // SetHideLayerAndSubtree is cleaned up. (crbug.com/595843)
   bool subtree_hidden;
   bool has_potential_filter_animation;
   bool has_potential_opacity_animation;
@@ skipping 10 matching lines @@
   int mask_layer_id;
 
   bool operator==(const EffectNode& other) const;
 
   void AsValueInto(base::trace_event::TracedValue* value) const;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_EFFECT_NODE_H_