Compute if a layer is drawn without LayerTree hierarchy

cc/trees/layer_tree_host_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.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 620 matching lines @@
       return;
     }
 
     SetAfterValues(layer_tree_host()->root_layer());
   }
 
   void AfterTest() override {}
 
   void VerifyBeforeValues(Layer* layer) {
     EXPECT_EQ(gfx::Size(10, 10).ToString(), layer->bounds().ToString());
-    EXPECT_FALSE(layer->hide_layer_and_subtree());
+    EXPECT_NE(layer->opacity(), 0.f);
     EXPECT_FALSE(layer->DrawsContent());
   }
 
   void SetBeforeValues(Layer* layer) {
     layer->SetBounds(gfx::Size(10, 10));
-    layer->SetHideLayerAndSubtree(false);
+    layer->SetOpacity(1.f);
     layer->SetIsDrawable(false);
   }
 
   void VerifyAfterValues(LayerImpl* layer) {
     switch (static_cast<Properties>(index_)) {
       case STARTUP:
       case DONE:
         break;
       case BOUNDS:
         EXPECT_EQ(gfx::Size(20, 20).ToString(), layer->bounds().ToString());
         break;
       case HIDE_LAYER_AND_SUBTREE:
-        EXPECT_TRUE(layer->hide_layer_and_subtree());
+        EXPECT_EQ(layer->opacity(), 0.f);
         break;
       case DRAWS_CONTENT:
         EXPECT_TRUE(layer->DrawsContent());
         break;
     }
   }
 
   void SetAfterValues(Layer* layer) {
     switch (static_cast<Properties>(index_)) {
       case STARTUP:
       case DONE:
         break;
       case BOUNDS:
         layer->SetBounds(gfx::Size(20, 20));
         break;
       case HIDE_LAYER_AND_SUBTREE:
-        layer->SetHideLayerAndSubtree(true);
+        // Set opacity to 0 to hide subtree.
+        layer->SetOpacity(0.f);
         break;
       case DRAWS_CONTENT:
         layer->SetIsDrawable(true);
         break;
     }
   }
 
   int index_;
 };
 
@@ skipping 5904 matching lines @@
     EndTest();
   }
 
   void AfterTest() override {}
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestPaintedDeviceScaleFactor);
 
 }  // namespace
 }  // namespace cc