Don't show the shadow for maximized/fullscreen window

BUG=407966
TEST=covered by unit test.

Committed: https://crrev.com/deecdafa38a9effc737acde28e82a32cc527a1b5
Cr-Commit-Position: refs/heads/master@{#309272}

Review URL: https://codereview.chromium.org/778283002

Cr-Commit-Position: refs/heads/master@{#310190}

ui/wm/core/shadow_controller.cc

@@ -10,10 +10,12 @@
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/scoped_observer.h"
+#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/env.h"
 #include "ui/aura/env_observer.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
+#include "ui/base/ui_base_types.h"
 #include "ui/compositor/layer.h"
 #include "ui/wm/core/shadow.h"
 #include "ui/wm/core/shadow_types.h"
@@ -169,7 +171,7 @@ void ShadowController::Impl::OnWindowInitialized(aura::Window* window) {
 void ShadowController::Impl::OnWindowPropertyChanged(aura::Window* window,
                                                      const void* key,
                                                      intptr_t old) {
-  if (key == kShadowTypeKey) {
+  if (key == kShadowTypeKey || key == aura::client::kShowStateKey) {
     HandlePossibleShadowVisibilityChange(window);
     return;
   }
@@ -207,6 +209,13 @@ void ShadowController::Impl::OnWindowActivated(aura::Window* gained_active,
 
 bool ShadowController::Impl::ShouldShowShadowForWindow(
     aura::Window* window) const {
+  ui::WindowShowState show_state =
+      window->GetProperty(aura::client::kShowStateKey);
+  if (show_state == ui::SHOW_STATE_FULLSCREEN ||
+      show_state == ui::SHOW_STATE_MAXIMIZED) {
+    return SHADOW_TYPE_NONE;
+  }
+
   const ShadowType type = GetShadowType(window);
   switch (type) {
     case SHADOW_TYPE_NONE:

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());