cc : Store surface layer ids on LayerTreeHost and push them at commit

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 3467 matching lines @@
     child->SetDrawsContent(true);
     child->SetPrimarySurfaceInfo(
         SurfaceInfo(primary_surfaces[i], 1.f /* device_scale_factor */,
                     gfx::Size(10, 10) /* size_in_pixels */));
     child->SetFallbackSurfaceInfo(
         SurfaceInfo(fallback_surfaces[i], 1.f /* device_scale_factor */,
                     gfx::Size(10, 10) /* size_in_pixels */));
     root->test_properties()->AddChild(std::move(child));
   }
 
+  base::flat_set<SurfaceId> fallback_surfaces_set;
+  for (size_t i = 0; i < fallback_surfaces.size(); ++i) {
+    fallback_surfaces_set.insert(fallback_surfaces[i]);
+  }
+
   host_impl_->active_tree()->BuildPropertyTreesForTesting();
+  host_impl_->active_tree()->SetSurfaceLayerIds(fallback_surfaces_set);
   DrawFrame();
 
   FakeCompositorFrameSink* fake_compositor_frame_sink =
       static_cast<FakeCompositorFrameSink*>(
           host_impl_->compositor_frame_sink());
   const CompositorFrameMetadata& metadata =
       fake_compositor_frame_sink->last_sent_frame()->metadata;
   EXPECT_THAT(
       metadata.activation_dependencies,
       testing::UnorderedElementsAre(primary_surfaces[0], primary_surfaces[1]));
@@ skipping 8904 matching lines @@
 
 TEST_F(LayerTreeHostImplTest, RasterColorSpace) {
   LayerTreeSettings settings = DefaultSettings();
   settings.enable_color_correct_rasterization = true;
   CreateHostImpl(settings, CreateCompositorFrameSink());
   EXPECT_EQ(host_impl_->GetRasterColorSpace(), gfx::ColorSpace::CreateSRGB());
 }
 
 }  // namespace
 }  // namespace cc