Compute if a layer is drawn without LayerTree hierarchy

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 62c620643b95ac62fe7f252dd4d5915329f764f8..0d78c647e8817f3310c63487654de364d9313668 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -638,13 +638,13 @@ class LayerTreeHostTestPushPropertiesTo : public LayerTreeHostTest {
 
   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);
   }
 
@@ -657,7 +657,7 @@ class LayerTreeHostTestPushPropertiesTo : public LayerTreeHostTest {
         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());
@@ -674,7 +674,8 @@ class LayerTreeHostTestPushPropertiesTo : public LayerTreeHostTest {
         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);