Allow switching DirectCompositionSurfaceWin between drawing modes.

cc/output/software_renderer.cc

 // Copyright 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 "cc/output/software_renderer.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/base/render_surface_filters.h"
@@ skipping 565 matching lines @@
 
   std::unique_ptr<SkBitmap> bitmap(new SkBitmap);
   bitmap->setInfo(SkImageInfo::MakeN32Premul(window_copy_rect.width(),
                                              window_copy_rect.height()));
   current_canvas_->readPixels(
       bitmap.get(), window_copy_rect.x(), window_copy_rect.y());
 
   request->SendBitmapResult(std::move(bitmap));
 }
 
+void SoftwareRenderer::SetEnableDCLayers(bool enable) {
+  NOTIMPLEMENTED();
+}
+
 void SoftwareRenderer::DidChangeVisibility() {
   if (visible_)
     output_surface_->EnsureBackbuffer();
   else
     output_surface_->DiscardBackbuffer();
 }
 
 bool SoftwareRenderer::ShouldApplyBackgroundFilters(
     const RenderPassDrawQuad* quad,
     const FilterOperations* background_filters) const {
@@ skipping 123 matching lines @@
       ApplyImageFilter(filter.get(), quad, backdrop_bitmap, nullptr);
 
   if (!filter_backdrop_image)
     return nullptr;
 
   return filter_backdrop_image->makeShader(content_tile_mode, content_tile_mode,
                                            &filter_backdrop_transform);
 }
 
 }  // namespace cc