Ignore fullscreen windows which are behind other windows for fullscreen mode.

ash/root_window_controller_unittest.cc

Index: ash/root_window_controller_unittest.cc
diff --git a/ash/root_window_controller_unittest.cc b/ash/root_window_controller_unittest.cc
index d547a8a335099074ab4f11962e4f4da675a6a6d3..4b730070279c5b9f213e9d6f7e9d04c467e69340 100644
--- a/ash/root_window_controller_unittest.cc
+++ b/ash/root_window_controller_unittest.cc
@@ -454,7 +454,7 @@ TEST_F(RootWindowControllerTest, ModalContainerBlockedSession) {
   }
 }
 
-TEST_F(RootWindowControllerTest, GetTopmostFullscreenWindow) {
+TEST_F(RootWindowControllerTest, GetWindowForFullscreenMode) {
   UpdateDisplay("600x600");
   internal::RootWindowController* controller =
       Shell::GetInstance()->GetPrimaryRootWindowController();
@@ -467,15 +467,14 @@ TEST_F(RootWindowControllerTest, GetTopmostFullscreenWindow) {
   Widget* w3 = Widget::CreateWindowWithParentAndBounds(NULL,
       w2->GetNativeWindow(), gfx::Rect(0, 0, 100, 100));
 
-  // Test that GetTopmostFullscreenWindow() finds the fullscreen window when one
+  // Test that GetWindowForFullscreenMode() finds the fullscreen window when one
   // of its transient children is active.
   w3->Activate();
-  EXPECT_EQ(w2->GetNativeWindow(), controller->GetTopmostFullscreenWindow());
+  EXPECT_EQ(w2->GetNativeWindow(), controller->GetWindowForFullscreenMode());
 
-  // Since there's only one desktop workspace, it always returns the same
-  // fullscreen window.
+  // If the topmost window is not fullscreen, it returns NULL.
   w1->Activate();
-  EXPECT_EQ(w2->GetNativeWindow(), controller->GetTopmostFullscreenWindow());
+  EXPECT_EQ(NULL, controller->GetWindowForFullscreenMode());
 }
 
 TEST_F(RootWindowControllerTest, MultipleFullscreenWindows) {
@@ -490,16 +489,15 @@ TEST_F(RootWindowControllerTest, MultipleFullscreenWindows) {
   Widget* w3 = CreateTestWidget(gfx::Rect(0, 0, 100, 100));
   w3->SetFullscreen(true);
 
-  // Test that GetTopmostFullscreenWindow() finds the active fullscreen window.
+  // Test that GetWindowForFullscreenMode() finds the active fullscreen window.
   w2->Activate();
-  EXPECT_EQ(w2->GetNativeWindow(), controller->GetTopmostFullscreenWindow());
+  EXPECT_EQ(w2->GetNativeWindow(), controller->GetWindowForFullscreenMode());
   w3->Activate();
-  EXPECT_EQ(w3->GetNativeWindow(), controller->GetTopmostFullscreenWindow());
+  EXPECT_EQ(w3->GetNativeWindow(), controller->GetWindowForFullscreenMode());
 
-  // If the active window is not fullscreen, it still returns the topmost
-  // fullscreen window, which is the last active one.
+  // If the active window is not fullscreen, it returns NULL.
   w1->Activate();
-  EXPECT_EQ(w3->GetNativeWindow(), controller->GetTopmostFullscreenWindow());
+  EXPECT_EQ(NULL, controller->GetWindowForFullscreenMode());
 }
 
 // Test that user session window can't be focused if user session blocked by