Makes visbility inherited. That is, in order for a window to be

ui/gfx/compositor/layer_unittest.cc

Index: ui/gfx/compositor/layer_unittest.cc
diff --git a/ui/gfx/compositor/layer_unittest.cc b/ui/gfx/compositor/layer_unittest.cc
index 0c479260865b38069974b81ed53f207805c3e144..b3ddaa0e32cf9a3b4eea85e57bdd3352e7bee593 100644
--- a/ui/gfx/compositor/layer_unittest.cc
+++ b/ui/gfx/compositor/layer_unittest.cc
@@ -476,5 +476,43 @@ TEST_F(LayerTest, NoCompositor) {
   EXPECT_EQ(NULL, l122->texture());
 }
 
+// Various visibile/drawn assertions.
+TEST_F(LayerTest, Visibility) {
+  scoped_ptr<Layer> l1(new Layer(NULL, Layer::LAYER_HAS_TEXTURE));
+  scoped_ptr<Layer> l2(new Layer(NULL, Layer::LAYER_HAS_TEXTURE));
+  scoped_ptr<Layer> l3(new Layer(NULL, Layer::LAYER_HAS_TEXTURE));
+  l1->Add(l2.get());
+  l2->Add(l3.get());
+
+  NullLayerDelegate delegate;
+  l1->set_delegate(&delegate);
+  l2->set_delegate(&delegate);
+  l3->set_delegate(&delegate);
+
+  // Layers should initially be drawn.
+  EXPECT_TRUE(l1->IsDrawn());
+  EXPECT_TRUE(l2->IsDrawn());
+  EXPECT_TRUE(l3->IsDrawn());
+
+  compositor()->SetRootLayer(l1.get());
+
+  Draw();
+
+  l1->SetVisible(false);
+  EXPECT_FALSE(l1->IsDrawn());
+  EXPECT_FALSE(l2->IsDrawn());
+  EXPECT_FALSE(l3->IsDrawn());
+
+  l3->SetVisible(false);
+  EXPECT_FALSE(l1->IsDrawn());
+  EXPECT_FALSE(l2->IsDrawn());
+  EXPECT_FALSE(l3->IsDrawn());
+
+  l1->SetVisible(true);
+  EXPECT_TRUE(l1->IsDrawn());
+  EXPECT_TRUE(l2->IsDrawn());
+  EXPECT_FALSE(l3->IsDrawn());
+}
+
 } // namespace ui