Match html canvas which is transferred to OffscreenCanvas to CSS style

ui/compositor/layer.cc

 // 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.
 
 #include "ui/compositor/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 647 matching lines @@
 void Layer::SetShowSurface(
     const cc::SurfaceId& surface_id,
     const cc::SurfaceLayer::SatisfyCallback& satisfy_callback,
     const cc::SurfaceLayer::RequireCallback& require_callback,
     const gfx::Size& surface_size_in_pixels,
     float scale) {
   DCHECK(type_ == LAYER_TEXTURED || type_ == LAYER_SOLID_COLOR);
 
   scoped_refptr<cc::SurfaceLayer> new_layer =
       cc::SurfaceLayer::Create(satisfy_callback, require_callback);
-  new_layer->SetSurfaceId(surface_id, scale, surface_size_in_pixels);
+  new_layer->SetSurfaceId(surface_id, scale, surface_size_in_pixels,
+                          false /* stretch_content_to_fill_bounds */);
   SwitchToLayer(new_layer);
   surface_layer_ = new_layer;
 
   frame_size_in_dip_ = gfx::ConvertSizeToDIP(scale, surface_size_in_pixels);
   RecomputeDrawsContentAndUVRect();
 
   for (const auto& mirror : mirrors_) {
     mirror->dest()->SetShowSurface(surface_id, satisfy_callback,
                                    require_callback, surface_size_in_pixels,
                                    scale);
@@ skipping 493 matching lines @@
   const auto it = std::find_if(mirrors_.begin(), mirrors_.end(),
       [mirror](const std::unique_ptr<LayerMirror>& mirror_ptr) {
         return mirror_ptr.get() == mirror;
       });
 
   DCHECK(it != mirrors_.end());
   mirrors_.erase(it);
 }
 
 }  // namespace ui