Compute if a layer is drawn without LayerTree hierarchy

cc/trees/layer_tree_host_pixeltest_readback.cc

 // Copyright 2013 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 "build/build_config.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/layers/texture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/test/fake_picture_layer.h"
@@ skipping 245 matching lines @@
       target.get(),
       base::FilePath(FILE_PATH_LITERAL("green_small_with_blue_corner.png")));
 }
 
 TEST_P(LayerTreeHostReadbackPixelTest, ReadbackHiddenSubtree) {
   scoped_refptr<SolidColorLayer> background =
       CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorBLACK);
 
   scoped_refptr<SolidColorLayer> hidden_target =
       CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorGREEN);
-  hidden_target->SetHideLayerAndSubtree(true);
+  // Set opacity to 0 to hide subtree.
+  hidden_target->SetOpacity(0.f);
   background->AddChild(hidden_target);
 
   scoped_refptr<SolidColorLayer> blue =
       CreateSolidColorLayer(gfx::Rect(150, 150, 50, 50), SK_ColorBLUE);
   hidden_target->AddChild(blue);
 
   RunReadbackTestWithReadbackTarget(
       GetParam().pixel_test_type, GetParam().readback_type, background,
       hidden_target.get(),
       base::FilePath(FILE_PATH_LITERAL("green_with_blue_corner.png")));
 }
 
 TEST_P(LayerTreeHostReadbackPixelTest,
        HiddenSubtreeNotVisibleWhenDrawnForReadback) {
   scoped_refptr<SolidColorLayer> background =
       CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorBLACK);
 
   scoped_refptr<SolidColorLayer> hidden_target =
       CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorGREEN);
-  hidden_target->SetHideLayerAndSubtree(true);
+  // Set opacity to 0 to hide subtree.
+  hidden_target->SetOpacity(0.f);
   background->AddChild(hidden_target);
 
   scoped_refptr<SolidColorLayer> blue =
       CreateSolidColorLayer(gfx::Rect(150, 150, 50, 50), SK_ColorBLUE);
   hidden_target->AddChild(blue);
 
   hidden_target->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
       base::Bind(&IgnoreReadbackResult)));
   RunReadbackTest(GetParam().pixel_test_type, GetParam().readback_type,
                   background, base::FilePath(FILE_PATH_LITERAL("black.png")));
@@ skipping 251 matching lines @@
                            READBACK_DEFAULT),
         ReadbackTestConfig(LayerTreeHostReadbackPixelTest::PIXEL_TEST_GL,
                            READBACK_DEFAULT),
         ReadbackTestConfig(LayerTreeHostReadbackPixelTest::PIXEL_TEST_GL,
                            READBACK_BITMAP)));
 
 }  // namespace
 }  // namespace cc
 
 #endif  // OS_ANDROID