Shifting layer position for sticky element to avoid passing unnessary variable to cc

cc/layers/layer.cc

 // Copyright 2010 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.
 
 #include "cc/layers/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1092 matching lines @@
 void Layer::SetStickyPositionConstraint(
     const LayerStickyPositionConstraint& constraint) {
   DCHECK(IsPropertyChangeAllowed());
   if (inputs_.sticky_position_constraint == constraint)
     return;
   inputs_.sticky_position_constraint = constraint;
   SetPropertyTreesNeedRebuild();
   SetNeedsCommit();
 }
 
-void Layer::SetOffsetForStickyPositionFromMainThread(const gfx::Size& offset) {
-  DCHECK(IsPropertyChangeAllowed());
-  if (inputs_.offset_for_sticky_position_from_main_thread == offset)
-    return;
-  inputs_.offset_for_sticky_position_from_main_thread = offset;
-
-  if (!layer_tree_host_)
-    return;
-
-  SetSubtreePropertyChanged();
-  PropertyTrees* property_trees = layer_tree_host_->property_trees();
-  if (TransformNode* transform_node =
-          property_trees->transform_tree.FindNodeFromElementId(
-              inputs_.element_id)) {
-    DCHECK_EQ(transform_tree_index(), transform_node->id);
-    transform_node->offset_for_sticky_position_from_main_thread =
-        gfx::Vector2dF(offset.width(), offset.height());
-    transform_node->needs_local_transform_update = true;
-    transform_node->transform_changed = true;
-    layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
-  }
-
-  SetNeedsCommit();
-}
-
 static void RunCopyCallbackOnMainThread(
     std::unique_ptr<CopyOutputRequest> request,
     std::unique_ptr<CopyOutputResult> result) {
   request->SendResult(std::move(result));
 }
 
 static void PostCopyCallbackToMainThread(
     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner,
     std::unique_ptr<CopyOutputRequest> request,
     std::unique_ptr<CopyOutputResult> result) {
@@ skipping 305 matching lines @@
       ->subtree_has_copy_request;
 }
 
 gfx::Transform Layer::ScreenSpaceTransform() const {
   DCHECK_NE(transform_tree_index_, TransformTree::kInvalidNodeId);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc