Don't show the shadow for maximized/fullscreen window

ui/wm/core/shadow_controller_unittest.cc

Index: ui/wm/core/shadow_controller_unittest.cc
diff --git a/ui/wm/core/shadow_controller_unittest.cc b/ui/wm/core/shadow_controller_unittest.cc
index 18116d42576d66fceb2e7ef4e18497d275eec992..6e3818be19481297d9ad7395520c145b7ed98ddd 100644
--- a/ui/wm/core/shadow_controller_unittest.cc
+++ b/ui/wm/core/shadow_controller_unittest.cc
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/test/aura_test_base.h"
 #include "ui/aura/window.h"
@@ -154,6 +155,30 @@ TEST_F(ShadowControllerTest, ShadowStyle) {
   EXPECT_EQ(Shadow::STYLE_ACTIVE, shadow2->style());
 }
 
+// Tests that shadow gets updated when the window show state chagnes.
+TEST_F(ShadowControllerTest, ShowState) {
+  ShadowController::TestApi api(shadow_controller());
+
+  scoped_ptr<aura::Window> window(new aura::Window(NULL));
+  window->SetType(ui::wm::WINDOW_TYPE_NORMAL);
+  window->Init(aura::WINDOW_LAYER_TEXTURED);
+  ParentWindow(window.get());
+  window->Show();
+
+  Shadow* shadow = api.GetShadowForWindow(window.get());
+  ASSERT_TRUE(shadow != NULL);
+  EXPECT_EQ(Shadow::STYLE_INACTIVE, shadow->style());
+
+  window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MAXIMIZED);
+  EXPECT_FALSE(shadow->layer()->visible());
+
+  window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_NORMAL);
+  EXPECT_TRUE(shadow->layer()->visible());
+
+  window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_FULLSCREEN);
+  EXPECT_FALSE(shadow->layer()->visible());
+}
+
 // Tests that we use smaller shadows for tooltips and menus.
 TEST_F(ShadowControllerTest, SmallShadowsForTooltipsAndMenus) {
   ShadowController::TestApi api(shadow_controller());