Add a NOT_DRAWN window in between the root_window and its children.

ash/devtools/ash_devtools_unittest.cc

 // Copyright 2016 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 "ash/devtools/ash_devtools_css_agent.h"
 #include "ash/devtools/ash_devtools_dom_agent.h"
 #include "ash/root_window_controller.h"
 #include "ash/test/ash_test.h"
 #include "ash/wm/widget_finder.h"
 #include "ash/wm_shell.h"
@@ skipping 329 matching lines @@
   Compare(widget, widget_node);
   // Destroy NativeWidget followed by |widget|
   widget->CloseNow();
 }
 
 TEST_F(AshDevToolsTest, WindowAddedChildNodeInserted) {
   // Initialize DOMAgent
   std::unique_ptr<ui::devtools::protocol::DOM::Node> root;
   dom_agent()->getDocument(&root);
 
-  WmWindow* parent_window = WmShell::Get()->GetPrimaryRootWindow();
-  DOM::Node* parent_node = root->getChildren(nullptr)->get(0);
+  WmWindow* parent_window =
+      WmShell::Get()->GetPrimaryRootWindow()->GetChildren()[0];
+  DOM::Node* parent_node =
+      root->getChildren(nullptr)->get(0)->getChildren(nullptr)->get(0);
   Array<DOM::Node>* parent_node_children = parent_node->getChildren(nullptr);
   DOM::Node* sibling_node =
       parent_node_children->get(parent_node_children->length() - 1);
 
   std::unique_ptr<WindowOwner> child_owner(CreateChildWindow(parent_window));
   ExpectChildNodeInserted(parent_node->getNodeId(), sibling_node->getNodeId());
 }
 
 TEST_F(AshDevToolsTest, WindowDestroyedChildNodeRemoved) {
   // Initialize DOMAgent
   std::unique_ptr<ui::devtools::protocol::DOM::Node> root;
   dom_agent()->getDocument(&root);
 
-  WmWindow* parent_window =
-      WmShell::Get()->GetPrimaryRootWindow()->GetChildren()[0];
+  WmWindow* parent_window = WmShell::Get()
+                                ->GetPrimaryRootWindow()
+                                ->GetChildren()[0]

[oshima, 2017/04/10 19:44:11]

define a utility function to get the parent window. It's probably better to use
the id rather than [0].

[wutao, 2017/04/10 23:03:54]

Done. And changed other related parts.

[oshima, 2017/04/11 21:48:08]

Sorry if it wasn't clear. I was thinking of something like

WmWindow* root_node_window = GetRootNodeWindow().

I'm not sure if it makes sense to use id for other windows. I'll defer to
sadrul@

[wutao, 2017/04/13 18:09:39]

I changed as sadrul@ suggested. GetPrimaryRootWindow().

+                                ->GetChildren()[0];
   WmWindow* child_window = parent_window->GetChildren()[0];
-  DOM::Node* root_node = root->getChildren(nullptr)->get(0);
+  DOM::Node* root_node =
+      root->getChildren(nullptr)->get(0)->getChildren(nullptr)->get(0);
   DOM::Node* parent_node = root_node->getChildren(nullptr)->get(0);
   DOM::Node* child_node = parent_node->getChildren(nullptr)->get(0);
 
   Compare(parent_window, parent_node);
   Compare(child_window, child_node);
   child_window->Destroy();
   ExpectChildNodeRemoved(parent_node->getNodeId(), child_node->getNodeId());
 }
 
 TEST_F(AshDevToolsTest, WindowReorganizedChildNodeRearranged) {
   // Initialize DOMAgent
   std::unique_ptr<ui::devtools::protocol::DOM::Node> root;
   dom_agent()->getDocument(&root);
 
-  WmWindow* root_window = WmShell::Get()->GetPrimaryRootWindow();
+  WmWindow* root_window =
+      WmShell::Get()->GetPrimaryRootWindow()->GetChildren()[0];
+
   WmWindow* target_window = root_window->GetChildren()[1];
   WmWindow* child_window = root_window->GetChildren()[0]->GetChildren()[0];
 
-  DOM::Node* root_node = root->getChildren(nullptr)->get(0);
+  DOM::Node* root_node =
+      root->getChildren(nullptr)->get(0)->getChildren(nullptr)->get(0);
   DOM::Node* parent_node = root_node->getChildren(nullptr)->get(0);
   DOM::Node* target_node = root_node->getChildren(nullptr)->get(1);
   Array<DOM::Node>* target_node_children = target_node->getChildren(nullptr);
   DOM::Node* sibling_node =
       target_node_children->get(target_node_children->length() - 1);
   DOM::Node* child_node = parent_node->getChildren(nullptr)->get(0);
 
   Compare(target_window, target_node);
   Compare(child_window, child_node);
   target_window->AddChild(child_window);
   ExpectChildNodeRemoved(parent_node->getNodeId(), child_node->getNodeId());
   ExpectChildNodeInserted(target_node->getNodeId(), sibling_node->getNodeId());
 }
 
 TEST_F(AshDevToolsTest, WindowReorganizedChildNodeRemovedAndInserted) {
-  WmWindow* root_window = WmShell::Get()->GetPrimaryRootWindow();
+  WmWindow* root_window =
+      WmShell::Get()->GetPrimaryRootWindow()->GetChildren()[0];
   WmWindow* target_window = root_window->GetChildren()[1];
   WmWindow* parent_window = root_window->GetChildren()[0];
   std::unique_ptr<WindowOwner> child_owner(CreateChildWindow(parent_window));
   WmWindow* child_window = child_owner->window();
 
   // Initialize DOMAgent
   std::unique_ptr<ui::devtools::protocol::DOM::Node> root;
   dom_agent()->getDocument(&root);
-  DOM::Node* root_node = root->getChildren(nullptr)->get(0);
+  DOM::Node* root_node =
+      root->getChildren(nullptr)->get(0)->getChildren(nullptr)->get(0);
 
   DOM::Node* parent_node = root_node->getChildren(nullptr)->get(0);
   DOM::Node* target_node = root_node->getChildren(nullptr)->get(1);
   Array<DOM::Node>* target_node_children = target_node->getChildren(nullptr);
   DOM::Node* sibling_node =
       target_node_children->get(target_node_children->length() - 1);
   Array<DOM::Node>* parent_node_children = parent_node->getChildren(nullptr);
   DOM::Node* child_node =
       parent_node_children->get(parent_node_children->length() - 1);
 
   Compare(target_window, target_node);
   Compare(child_window, child_node);
   parent_window->RemoveChild(child_window);
   target_window->AddChild(child_window);
   ExpectChildNodeRemoved(parent_node->getNodeId(), child_node->getNodeId());
   ExpectChildNodeInserted(target_node->getNodeId(), sibling_node->getNodeId());
 }
 
 TEST_F(AshDevToolsTest, WindowStackingChangedChildNodeRemovedAndInserted) {
   // Initialize DOMAgent
   std::unique_ptr<ui::devtools::protocol::DOM::Node> root;
   dom_agent()->getDocument(&root);
 
-  WmWindow* parent_window = WmShell::Get()->GetPrimaryRootWindow();
+  WmWindow* parent_window =
+      WmShell::Get()->GetPrimaryRootWindow()->GetChildren()[0];
   WmWindow* child_window = parent_window->GetChildren()[0];
   WmWindow* target_window = parent_window->GetChildren()[1];
 
-  DOM::Node* parent_node = root->getChildren(nullptr)->get(0);
+  DOM::Node* parent_node =
+      root->getChildren(nullptr)->get(0)->getChildren(nullptr)->get(0);
   Array<DOM::Node>* parent_node_children = parent_node->getChildren(nullptr);
   DOM::Node* child_node = parent_node_children->get(0);
   DOM::Node* sibling_node = parent_node_children->get(1);
   int parent_id = parent_node->getNodeId();
 
   Compare(parent_window, parent_node);
   Compare(child_window, child_node);
   parent_window->StackChildAbove(child_window, target_window);
   ExpectChildNodeRemoved(parent_id, child_node->getNodeId());
   ExpectChildNodeInserted(parent_id, sibling_node->getNodeId());
@@ skipping 316 matching lines @@
   SetStyleTexts(root_view_node, "\nheight: 73;\n  ", true);
   EXPECT_EQ(gfx::Rect(25, 35, 45, 73), root_view->bounds());
 
   SetStyleTexts(root_view_node, "\nx: 10; y: 23; width: 52;\nvisibility: 1;\n",
                 true);
   EXPECT_EQ(gfx::Rect(10, 23, 52, 73), root_view->bounds());
   EXPECT_TRUE(root_view->visible());
 }
 
 }  // namespace ash