Show overview mode button in TouchView with open modal window

ash/system/overview/overview_button_tray_unittest.cc

Index: ash/system/overview/overview_button_tray_unittest.cc
diff --git a/ash/system/overview/overview_button_tray_unittest.cc b/ash/system/overview/overview_button_tray_unittest.cc
index 3268b7b068989749befcef57f2a9f94a77738e2b..0465a4f2cadffa5dc8db556c085de084609c75ed 100644
--- a/ash/system/overview/overview_button_tray_unittest.cc
+++ b/ash/system/overview/overview_button_tray_unittest.cc
@@ -147,6 +147,23 @@ TEST_F(OverviewButtonTrayTest, VisibilityChangesForLoginStatus) {
       EnableMaximizeModeWindowManager(false);
 }
 
+// Tests that the overview button becomes visible when the user enters
+// maximize mode with a system modal window open, and that it hides once
+// the user exits maximize mode.
+TEST_F(OverviewButtonTrayTest, VisibilityChangesForSystemModalWindow) {
+  scoped_ptr<aura::Window> window(
+      CreateTestModalWindowInShellWithBounds(gfx::Rect(5, 5, 20, 20)));
+  ASSERT_TRUE(Shell::GetInstance()->IsSystemModalWindowOpen());
+  Shell::GetInstance()
+      ->maximize_mode_controller()
+      ->EnableMaximizeModeWindowManager(true);
+  EXPECT_TRUE(GetTray()->visible());
+  Shell::GetInstance()
+      ->maximize_mode_controller()
+      ->EnableMaximizeModeWindowManager(false);
+  EXPECT_FALSE(GetTray()->visible());
+}
+
 // Tests that the tray only renders as active while selection is ongoing. Any
 // dismissal of overview mode clears the active state.
 TEST_F(OverviewButtonTrayTest, ActiveStateOnlyDuringOverviewMode) {