aura: Draw drop shadows under browsers and menus.

ui/aura/window_unittest.cc

Index: ui/aura/window_unittest.cc
diff --git a/ui/aura/window_unittest.cc b/ui/aura/window_unittest.cc
index 386ddaab90976675149a0ef808955e2ba4e5ab00..08668bc5137af548b8d6943ea78de13fc37eb1bf 100644
--- a/ui/aura/window_unittest.cc
+++ b/ui/aura/window_unittest.cc
@@ -13,6 +13,7 @@
 #include "ui/aura/desktop_observer.h"
 #include "ui/aura/event.h"
 #include "ui/aura/focus_manager.h"
+#include "ui/aura/shadow.h"
 #include "ui/aura/test/aura_test_base.h"
 #include "ui/aura/test/event_generator.h"
 #include "ui/aura/test/test_windows.h"
@@ -659,6 +660,65 @@ TEST_F(WindowTest, StopsEventPropagation) {
   EXPECT_EQ(w121.get(), w1->GetFocusManager()->GetFocusedWindow());
 }
 
+// Tests that various methods in Window update the Shadow object as expected.
+TEST_F(WindowTest, Shadow) {
+  Window* window = new Window(NULL);
+  window->SetType(aura::WINDOW_TYPE_NORMAL);
+
+  // It should be safe to call this before the window has been initialized.
+  window->SetShadowVisible(true);
+  window->Init(ui::Layer::LAYER_HAS_TEXTURE);
+  window->SetParent(NULL);
+
+  // The shadow's layer should have the same parent as the window's.
+  const internal::Shadow* shadow = window->shadow();
+  ASSERT_TRUE(shadow != NULL);
+  EXPECT_EQ(window->parent()->layer(), shadow->layer()->parent());
+
+  // The shadow's visibility should be updated along with the window's.
+  window->Show();
+  EXPECT_TRUE(shadow->layer()->visible());
+  window->Hide();
+  EXPECT_FALSE(shadow->layer()->visible());
+
+  // If the shadow is disabled, it shouldn't be shown even when the window is.
+  window->SetShadowVisible(false);
+  window->Show();
+  EXPECT_FALSE(shadow->layer()->visible());
+  window->SetShadowVisible(true);
+  EXPECT_TRUE(shadow->layer()->visible());
+
+  // TODO(derat): Test stacking (after adding additional methods to ui::Layer so
+  // that stacking order can be queried).
+
+  // When we remove the window from the hierarchy, its shadow should be removed
+  // too.
+  window->parent()->RemoveChild(window);
+  EXPECT_TRUE(shadow->layer()->parent() == NULL);
+}
+
+// Tests that the window's shadow's bounds are updated correctly.
+TEST_F(WindowTest, ShadowBounds) {
+  Window* window = new Window(NULL);
+  window->SetType(aura::WINDOW_TYPE_NORMAL);
+  window->Init(ui::Layer::LAYER_HAS_TEXTURE);
+  window->SetParent(NULL);
+
+  const gfx::Rect kOldBounds(20, 30, 400, 300);
+  window->SetBounds(kOldBounds);
+
+  // When the shadow is first created, it should use the window's bounds.
+  window->SetShadowVisible(true);
+  const internal::Shadow* shadow = window->shadow();
+  ASSERT_TRUE(shadow != NULL);
+  EXPECT_EQ(kOldBounds, shadow->content_bounds());
+
+  // When we change the window's bounds, the shadow's shoudl be updated too.
+  gfx::Rect kNewBounds(50, 60, 500, 400);
+  window->SetBounds(kNewBounds);
+  EXPECT_EQ(kNewBounds, shadow->content_bounds());
+}
+
 // Various assertions for activating/deactivating.
 TEST_F(WindowTest, Deactivate) {
   TestWindowDelegate d1;