Disable DirectComposition underlays and complex transforms by default.

cc/output/gl_renderer_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 "cc/output/gl_renderer.h"
 
 #include <stdint.h>
 
 #include <set>
 #include <vector>
 
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
+#include "base/test/scoped_feature_list.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/base/math_util.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/output/overlay_strategy_single_on_top.h"
 #include "cc/output/overlay_strategy_underlay.h"
 #include "cc/output/texture_mailbox_deleter.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
@@ skipping 2000 matching lines @@
  public:
   void GetStrategies(OverlayProcessor::StrategyList* strategies) override {}
   bool AllowCALayerOverlays() override { return false; }
   bool AllowDCLayerOverlays() override { return true; }
   void CheckOverlaySupport(OverlayCandidateList* surfaces) override {}
 };
 
 // Test that SetEnableDCLayersCHROMIUM is properly called when enabling
 // and disabling DC layers.
 TEST_F(GLRendererTest, DCLayerOverlaySwitch) {
+  base::test::ScopedFeatureList feature_list;
+  feature_list.InitAndEnableFeature(features::kDirectCompositionUnderlays);
   auto gl_owned = base::MakeUnique<PartialSwapMockGLES2Interface>(true);
   auto* gl = gl_owned.get();
 
   auto provider = TestContextProvider::Create(std::move(gl_owned));
   provider->BindToCurrentThread();
 
   FakeOutputSurfaceClient output_surface_client;
   std::unique_ptr<FakeOutputSurface> output_surface(
       FakeOutputSurface::Create3d(std::move(provider)));
   output_surface->BindToClient(&output_surface_client);
@@ skipping 212 matching lines @@
 
 TEST_F(GLRendererSwapWithBoundsTest, NonEmpty) {
   std::vector<gfx::Rect> content_bounds;
   content_bounds.push_back(gfx::Rect(0, 0, 10, 10));
   content_bounds.push_back(gfx::Rect(20, 20, 30, 30));
   RunTest(content_bounds);
 }
 
 }  // namespace
 }  // namespace cc