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

ash/shelf/shelf_layout_manager_unittest.cc

Index: ash/shelf/shelf_layout_manager_unittest.cc
diff --git a/ash/shelf/shelf_layout_manager_unittest.cc b/ash/shelf/shelf_layout_manager_unittest.cc
index 1009ce98d7d55ec4398c5b35945de90c6b90cd87..220a257dad3949d6a25e994f0f9636d3703c00f7 100644
--- a/ash/shelf/shelf_layout_manager_unittest.cc
+++ b/ash/shelf/shelf_layout_manager_unittest.cc
@@ -1296,8 +1296,8 @@ TEST_F(ShelfLayoutManagerTest, OpenAppListWithShelfAutoHideState) {
   EXPECT_EQ(SHELF_AUTO_HIDE, shelf->visibility_state());
 }
 
-// Makes sure shelf will be hidden when app list opens as shelf is in HIDDEN
-// state, and toggling app list won't change shelf visibility state.
+// Toggling the app list removes activation from the fullscreen window and so
+// the shelf should be visible while the app list is shown.
 TEST_F(ShelfLayoutManagerTest, OpenAppListWithShelfHiddenState) {
   Shell* shell = Shell::GetInstance();
   ShelfLayoutManager* shelf = GetShelfLayoutManager();
@@ -1318,7 +1318,7 @@ TEST_F(ShelfLayoutManagerTest, OpenAppListWithShelfHiddenState) {
   // Toggle app list to show.
   shell->ToggleAppList(NULL);
   EXPECT_TRUE(shell->GetAppListTargetVisibility());
-  EXPECT_EQ(SHELF_HIDDEN, shelf->visibility_state());
+  EXPECT_EQ(SHELF_VISIBLE, shelf->visibility_state());
 
   // Toggle app list to hide.
   shell->ToggleAppList(NULL);
@@ -1326,6 +1326,31 @@ TEST_F(ShelfLayoutManagerTest, OpenAppListWithShelfHiddenState) {
   EXPECT_EQ(SHELF_HIDDEN, shelf->visibility_state());
 }
 
+// Tests that the shelf is only hidden for an active fullscreen window and
+// toggles visibility when another window is activated.
+TEST_F(ShelfLayoutManagerTest, ActiveFullscreenWindowHidesShelf) {
+  ShelfLayoutManager* shelf = GetShelfLayoutManager();
+
+  // Create a window and make it full screen.
+  aura::Window* window1 = CreateTestWindow();
+  window1->SetBounds(gfx::Rect(0, 0, 100, 100));
+  window1->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_FULLSCREEN);
+  window1->Show();
+
+  aura::Window* window2 = CreateTestWindow();
+  window2->SetBounds(gfx::Rect(0, 0, 100, 100));
+  window2->Show();
+
+  wm::GetWindowState(window1)->Activate();
+  EXPECT_EQ(SHELF_HIDDEN, shelf->visibility_state());
+
+  wm::GetWindowState(window2)->Activate();
+  EXPECT_EQ(SHELF_VISIBLE, shelf->visibility_state());
+
+  wm::GetWindowState(window1)->Activate();
+  EXPECT_EQ(SHELF_HIDDEN, shelf->visibility_state());
+}
+
 #if defined(OS_WIN)
 // RootWindow and Display can't resize on Windows Ash. http://crbug.com/165962
 #define MAYBE_SetAlignment DISABLED_SetAlignment