Create a unified UIElement interface for Widget, View and Window.

ash/devtools/ash_devtools_unittest.cc

Index: ash/devtools/ash_devtools_unittest.cc
diff --git a/ash/devtools/ash_devtools_unittest.cc b/ash/devtools/ash_devtools_unittest.cc
index 53b01c3293767091f0c282cf04fbae6d487af1a8..c276fdd96a1a875ad73553a81f9b33ea497c4a12 100644
--- a/ash/devtools/ash_devtools_unittest.cc
+++ b/ash/devtools/ash_devtools_unittest.cc
@@ -4,6 +4,8 @@
 
 #include "ash/devtools/ash_devtools_css_agent.h"
 #include "ash/devtools/ash_devtools_dom_agent.h"
+#include "ash/devtools/ui_element.h"
+#include "ash/devtools/window_element.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
@@ -634,6 +636,23 @@ TEST_F(AshDevToolsTest, WindowWidgetViewHighlight) {
   EXPECT_FALSE(GetHighlightingWindow(0)->IsVisible());
 }
 
+int GetNodeIdFromWindow(devtools::UIElement* ui_element, aura::Window* window) {
+  for (auto* child : ui_element->GetChildren()) {
+    if (child->GetType() == devtools::UIElementType::WINDOW &&
+        static_cast<devtools::WindowElement*>(child)->window() == window) {
+      return child->GetNodeId();
+    }
+  }
+  for (auto* child : ui_element->GetChildren()) {
+    if (child->GetType() == devtools::UIElementType::WINDOW) {
+      int node_id = GetNodeIdFromWindow(child, window);
+      if (node_id > 0)
+        return node_id;
+    }
+  }
+  return 0;
+}
+
 TEST_F(AshDevToolsTest, MultipleDisplayHighlight) {
   UpdateDisplay("300x400,500x500");
 
@@ -645,12 +664,14 @@ TEST_F(AshDevToolsTest, MultipleDisplayHighlight) {
   dom_agent()->getDocument(&root);
 
   EXPECT_EQ(root_windows[0], window->GetRootWindow());
-  HighlightNode(dom_agent()->GetNodeIdFromWindow(window.get()));
+  HighlightNode(
+      GetNodeIdFromWindow(dom_agent()->GetWindowElementRoot(), window.get()));
   ExpectHighlighted(window->GetBoundsInScreen(), 0);
 
   window->SetBoundsInScreen(gfx::Rect(500, 0, 50, 50), GetSecondaryDisplay());
   EXPECT_EQ(root_windows[1], window->GetRootWindow());
-  HighlightNode(dom_agent()->GetNodeIdFromWindow(window.get()));
+  HighlightNode(
+      GetNodeIdFromWindow(dom_agent()->GetWindowElementRoot(), window.get()));
   ExpectHighlighted(window->GetBoundsInScreen(), 1);
 }