Compute if a layer is drawn without LayerTree hierarchy

cc/trees/occlusion_tracker_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/trees/occlusion_tracker.h"
 
 #include <stddef.h>
 
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/base/math_util.h"
@@ skipping 2054 matching lines @@
                                         gfx::PointF(), gfx::Size());
     LayerImpl* copy =
         this->CreateLayer(hide, this->identity_matrix, gfx::PointF(100.f, 0.f),
                           gfx::Size(200, 400));
     this->AddCopyRequest(copy);
     LayerImpl* copy_child = this->CreateDrawingLayer(
         copy, this->identity_matrix, gfx::PointF(), gfx::Size(200, 400), true);
 
     // The |copy| layer is hidden but since it is being copied, it will be
     // drawn.
-    hide->SetHideLayerAndSubtree(true);
+    hide->SetOpacity(0.f);
 
     this->CalcDrawEtc(root);
 
     TestOcclusionTrackerWithClip occlusion(gfx::Rect(0, 0, 1000, 1000));
 
     this->VisitLayer(copy_child, &occlusion);
     EXPECT_EQ(gfx::Rect().ToString(),
               occlusion.occlusion_from_outside_target().ToString());
     EXPECT_EQ(gfx::Rect(200, 400).ToString(),
               occlusion.occlusion_from_inside_target().ToString());
@@ skipping 427 matching lines @@
     EXPECT_EQ(gfx::Rect(),
               occlusion.UnoccludedSurfaceContentRect(
                   surface, gfx::Rect(80, 70, 50, 50)));
   }
 };
 
 ALL_OCCLUSIONTRACKER_TEST(OcclusionTrackerTestUnoccludedSurfaceQuery)
 
 }  // namespace
 }  // namespace cc