Consolidate two IsArcWindow functions to reduce code duplication

components/arc/arc_util_unittest.cc

Index: components/arc/arc_util_unittest.cc
diff --git a/components/arc/arc_util_unittest.cc b/components/arc/arc_util_unittest.cc
index a39c92bbc15000dd76a49158bd464bbb1174fa52..45edda4f122aea4157a8f0a519fae84fbab7cc60 100644
--- a/components/arc/arc_util_unittest.cc
+++ b/components/arc/arc_util_unittest.cc
@@ -7,11 +7,14 @@
 #include <memory>
 #include <string>
 
+#include "ash/shared/app_types.h"
+#include "ash/wm_window.h"
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/test/scoped_feature_list.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/aura/test/test_windows.h"
 
 namespace arc {
 namespace {
@@ -163,5 +166,20 @@ TEST_F(ArcUtilTest, IsArcOptInVerificationDisabled) {
   EXPECT_TRUE(IsArcOptInVerificationDisabled());
 }
 
+TEST_F(ArcUtilTest, IsArcAppWindow) {
+  std::unique_ptr<aura::Window> window(
+      aura::test::CreateTestWindowWithId(0, nullptr));
+  EXPECT_FALSE(IsArcAppWindow(window.get()));
+  ash::WmWindow* wm_window = ash::WmWindow::Get(window.get());
+  ASSERT_TRUE(wm_window);
+
+  wm_window->SetAppType(static_cast<int>(ash::AppType::CHROME_APP));
+  EXPECT_FALSE(IsArcAppWindow(window.get()));
+  wm_window->SetAppType(static_cast<int>(ash::AppType::ARC_APP));
+  EXPECT_TRUE(IsArcAppWindow(window.get()));
+
+  EXPECT_FALSE(IsArcAppWindow(nullptr));
+}
+
 }  // namespace
 }  // namespace arc