Reorder the NativeViews attached to a view via kViewHostKey according to the position of the view

ui/views/view_unittest.cc

 // Copyright (c) 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 <map>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/rand_util.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 3352 matching lines @@
   EXPECT_EQ(layer.get(), c1->layer());
 
   scoped_ptr<ui::Layer> layer2(c1->RecreateLayer());
   EXPECT_NE(c1->layer(), layer2.get());
 
   // Destroy view before destroying layer.
   c1.reset();
 }
 
 // Verify that new layer scales content only if the old layer does.
-TEST_F(ViewLayerTest, RecreateLayer) {
+TEST_F(ViewLayerTest, RecreateLayerScaling) {
   scoped_ptr<View> v(new View());
   v->SetPaintToLayer(true);
   // Set to non default value.
   v->layer()->set_scale_content(false);
   scoped_ptr<ui::Layer> old_layer(v->RecreateLayer());
   ui::Layer* new_layer = v->layer();
   EXPECT_FALSE(new_layer->scale_content());
 }
 
+// Verify the z-order of the layers as a result of calling RecreateLayer().
+TEST_F(ViewLayerTest, RecreateLayerZOrder) {
+  scoped_ptr<View> v(new View());
+  v->SetPaintToLayer(true);
+
+  View* v1 = new View();
+  v1->SetPaintToLayer(true);
+  v->AddChildView(v1);
+  View* v2 = new View();
+  v2->SetPaintToLayer(true);
+  v->AddChildView(v2);
+
+  // Test the initial z-order.
+  const std::vector<ui::Layer*>& child_layers_pre = v->layer()->children();
+  EXPECT_EQ(2u, child_layers_pre.size());
+  EXPECT_EQ(v1->layer(), child_layers_pre[0]);
+  EXPECT_EQ(v2->layer(), child_layers_pre[1]);
+
+  scoped_ptr<ui::Layer> v2_old_layer(v2->RecreateLayer());
+
+  // Test the new layer order. |v2_old_layer| should be underneath the layers
+  // for |v1| and |v2|.
+  const std::vector<ui::Layer*>& child_layers_post = v->layer()->children();
+  EXPECT_EQ(3u, child_layers_post.size());
+  EXPECT_EQ(v2_old_layer, child_layers_post[0]);
+  EXPECT_EQ(v1->layer(), child_layers_post[1]);
+  EXPECT_EQ(v2->layer(), child_layers_post[2]);
+}
+
+// Verify the z-order of the layers as a result of calling RecreateLayer when
+// the widget is the parent with the layer.
+TEST_F(ViewLayerTest, RecreateLayerZOrderWidgetParent) {
+  View* v = new View();
+  widget()->SetContentsView(v);
+
+  View* v1 = new View();
+  v1->SetPaintToLayer(true);
+  v->AddChildView(v1);
+  View* v2 = new View();
+  v2->SetPaintToLayer(true);
+  v->AddChildView(v2);
+
+  ui::Layer* root_layer = GetRootLayer();
+
+  // Test the initial z-order.
+  const std::vector<ui::Layer*>& child_layers_pre = root_layer->children();
+  EXPECT_EQ(2u, child_layers_pre.size());
+  EXPECT_EQ(v1->layer(), child_layers_pre[0]);
+  EXPECT_EQ(v2->layer(), child_layers_pre[1]);
+
+  scoped_ptr<ui::Layer> v2_old_layer(v2->RecreateLayer());
+
+  // Test the new layer order. |v2_old_layer| should be underneath the layers
+  // for |v1| and |v2|.
+  const std::vector<ui::Layer*>& child_layers_post = root_layer->children();
+  EXPECT_EQ(3u, child_layers_post.size());
+  EXPECT_EQ(v2_old_layer, child_layers_post[0]);
+  EXPECT_EQ(v1->layer(), child_layers_post[1]);
+  EXPECT_EQ(v2->layer(), child_layers_post[2]);
+}
+
 #endif  // USE_AURA
 
 }  // namespace views