Replace LayerImpl::sorting_context_id with transform reference.

cc/layers/nine_patch_layer_impl_unittest.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 <stddef.h>
 
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/nine_patch_layer_impl.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/resources/ui_resource_bitmap.h"
@@ skipping 48 matching lines @@
   layer->test_properties()->force_render_surface = true;
 
   UIResourceId uid = 1;
   bool is_opaque = false;
   UIResourceBitmap bitmap(bitmap_size, is_opaque);
 
   host_impl.CreateUIResource(uid, bitmap);
   layer->SetUIResourceId(uid);
   layer->SetImageBounds(bitmap_size);
   layer->SetLayout(aperture_rect, border, gfx::Rect(), fill_center, false);
+  host_impl.active_tree()->SetRootLayerForTesting(std::move(layer));
+  host_impl.active_tree()->BuildPropertyTreesForTesting();
+
   AppendQuadsData data;
-  layer->AppendQuads(render_pass.get(), &data);
+  host_impl.active_tree()->root_layer_for_testing()->AppendQuads(
+      render_pass.get(), &data);
 
   // Verify quad rects
   const QuadList& quads = render_pass->quad_list;
   EXPECT_EQ(expected_quad_size, quads.size());
 
   Region layer_remaining(visible_layer_rect);
   for (auto iter = quads.cbegin(); iter != quads.cend(); ++iter) {
     gfx::Rect quad_rect = iter->rect;
 
     EXPECT_TRUE(visible_layer_rect.Contains(quad_rect)) << iter.index();
@@ skipping 82 matching lines @@
   layer->test_properties()->force_render_surface = true;
 
   UIResourceId uid = 1;
   bool is_opaque = false;
   UIResourceBitmap bitmap(bitmap_size, is_opaque);
 
   host_impl.CreateUIResource(uid, bitmap);
   layer->SetUIResourceId(uid);
   layer->SetImageBounds(bitmap_size);
   layer->SetLayout(aperture_rect, border, occlusion, false, false);
+  host_impl.active_tree()->SetRootLayerForTesting(std::move(layer));
+  host_impl.active_tree()->BuildPropertyTreesForTesting();
+
   AppendQuadsData data;
-  layer->AppendQuads(render_pass.get(), &data);
+  host_impl.active_tree()->root_layer_for_testing()->AppendQuads(
+      render_pass.get(), &data);
 
   // Verify quad rects
   const QuadList& quads = render_pass->quad_list;
   EXPECT_EQ(expected_quad_size, quads.size());
 
   Region layer_remaining(visible_layer_rect);
   for (auto iter = quads.cbegin(); iter != quads.cend(); ++iter) {
     gfx::Rect quad_rect = iter->rect;
 
     EXPECT_TRUE(visible_layer_rect.Contains(quad_rect)) << iter.index();
@@ skipping 263 matching lines @@
 
     const QuadList &quad_list = impl.quad_list();
     for (QuadList::ConstBackToFrontIterator it = quad_list.BackToFrontBegin();
          it != quad_list.BackToFrontEnd(); ++it)
       EXPECT_TRUE(it->ShouldDrawWithBlending());
   }
 }
 
 }  // namespace
 }  // namespace cc