Set m_graphicsLayer as fixed position container

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 582 matching lines @@
     transform_node->transform_changed = true;
     layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
     SetNeedsCommitNoRebuild();
     return;
   }
 
   SetNeedsCommit();
 }
 
 bool Layer::IsContainerForFixedPositionLayers() const {
-  if (!inputs_.transform.IsIdentityOrTranslation())
-    return true;
-  if (parent_ && !parent_->inputs_.transform.IsIdentityOrTranslation())
-    return true;
   return inputs_.is_container_for_fixed_position_layers;
 }
 
 bool Are2dAxisAligned(const gfx::Transform& a, const gfx::Transform& b) {
   if (a.IsScaleOrTranslation() && b.IsScaleOrTranslation()) {
     return true;
   }
 
   gfx::Transform inverse(gfx::Transform::kSkipInitialization);
   if (b.GetInverse(&inverse)) {
@@ skipping 956 matching lines @@
       ->num_copy_requests_in_subtree;
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, TransformTree::kInvalidNodeId);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc