Match html canvas which is transferred to OffscreenCanvas to CSS style

cc/layers/painted_scrollbar_layer_impl.cc

 // Copyright 2013 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/painted_scrollbar_layer_impl.h"
 
 #include <algorithm>
 
 #include "base/memory/ptr_util.h"
 #include "cc/input/scrollbar_animation_controller.h"
@@ skipping 76 matching lines @@
     RenderPass* render_pass,
     AppendQuadsData* append_quads_data) {
   bool premultipled_alpha = true;
   bool flipped = false;
   bool nearest_neighbor = false;
   gfx::PointF uv_top_left(0.f, 0.f);
   gfx::PointF uv_bottom_right(1.f, 1.f);
 
   SharedQuadState* shared_quad_state =
       render_pass->CreateAndAppendSharedQuadState();
-  PopulateScaledSharedQuadState(shared_quad_state, internal_contents_scale_);
+  PopulateScaledSharedQuadState(shared_quad_state, internal_contents_scale_,
+                                internal_contents_scale_);
 
   AppendDebugBorderQuad(render_pass, internal_content_bounds_,
                         shared_quad_state, append_quads_data);
 
   gfx::Rect thumb_quad_rect = ComputeThumbQuadRect();
   gfx::Rect scaled_thumb_quad_rect =
       gfx::ScaleToEnclosingRect(thumb_quad_rect, internal_contents_scale_);
   gfx::Rect visible_thumb_quad_rect =
       draw_properties().occlusion_in_content_space.GetUnoccludedContentRect(
           thumb_quad_rect);
@@ skipping 94 matching lines @@
 
 bool PaintedScrollbarLayerImpl::IsThumbResizable() const {
   return false;
 }
 
 const char* PaintedScrollbarLayerImpl::LayerTypeAsString() const {
   return "cc::PaintedScrollbarLayerImpl";
 }
 
 }  // namespace cc