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

ash/wm/workspace/workspace_layout_manager_unittest.cc

Index: ash/wm/workspace/workspace_layout_manager_unittest.cc
diff --git a/ash/wm/workspace/workspace_layout_manager_unittest.cc b/ash/wm/workspace/workspace_layout_manager_unittest.cc
index 4302f1dc44f9bdb6093f59bc2a286b2d743ff77a..e8625c6102a8db61842ad13d130c7eca78783267 100644
--- a/ash/wm/workspace/workspace_layout_manager_unittest.cc
+++ b/ash/wm/workspace/workspace_layout_manager_unittest.cc
@@ -11,6 +11,7 @@
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
+#include "ash/shell_observer.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
@@ -47,6 +48,36 @@ class MaximizeDelegateView : public views::WidgetDelegateView {
   DISALLOW_COPY_AND_ASSIGN(MaximizeDelegateView);
 };
 
+class TestShellObserver : public ShellObserver {
+ public:
+  TestShellObserver() : call_count_(0),
+                        is_fullscreen_(false) {
+    Shell::GetInstance()->AddShellObserver(this);
+  }
+
+  virtual ~TestShellObserver() {
+    Shell::GetInstance()->RemoveShellObserver(this);
+  }
+
+  virtual void OnFullscreenStateChanged(bool is_fullscreen,
+                                        aura::Window* root_window) OVERRIDE {
+    call_count_++;
+    is_fullscreen_ = is_fullscreen;
+  }
+
+  int call_count() {
+    return call_count_;
+  }
+
+  bool is_fullscreen() {
+    return is_fullscreen_;
+  }
+
+ private:
+  int call_count_;
+  bool is_fullscreen_;
+};
+
 }  // namespace
 
 typedef test::AshTestBase WorkspaceLayoutManagerTest;
@@ -407,4 +438,33 @@ TEST_F(WorkspaceLayoutManagerTest, SizeToWorkArea) {
       window->bounds().ToString());
 }
 
+TEST_F(WorkspaceLayoutManagerTest, NotifyFullscreenChanges) {
+  TestShellObserver observer;
+  scoped_ptr<aura::Window> window1(
+      CreateTestWindowInShellWithBounds(gfx::Rect(1, 2, 30, 40)));
+  scoped_ptr<aura::Window> window2(
+      CreateTestWindowInShellWithBounds(gfx::Rect(1, 2, 30, 40)));
+  wm::WindowState* window_state1 = wm::GetWindowState(window1.get());
+  wm::WindowState* window_state2 = wm::GetWindowState(window2.get());
+  window_state2->Activate();
+
+  window_state2->ToggleFullscreen();
+  EXPECT_EQ(1, observer.call_count());
+  EXPECT_TRUE(observer.is_fullscreen());
+
+  // When window1 moves to the front the fullscreen state should change.
+  window_state1->Activate();
+  EXPECT_EQ(2, observer.call_count());
+  EXPECT_FALSE(observer.is_fullscreen());
+
+  // It should change back if window2 becomes active again.
+  window_state2->Activate();
+  EXPECT_EQ(3, observer.call_count());
+  EXPECT_TRUE(observer.is_fullscreen());
+
+  window_state2->ToggleFullscreen();
+  EXPECT_EQ(4, observer.call_count());
+  EXPECT_FALSE(observer.is_fullscreen());
+}
+
 }  // namespace ash