Exit overview mode when a new activity is opened in athena.

This has the side effect of fixing the crash in 396368

BUG=396368
TEST=Manual, see bug

Review URL: https://codereview.chromium.org/411813002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285393 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 18 insertions, 16 deletions

diff --git a/athena/home/home_card_unittest.cc b/athena/home/home_card_unittest.cc
index dbfd0ad..302acc3 100644
--- a/athena/home/home_card_unittest.cc
+++ b/athena/home/home_card_unittest.cc
@@ -57,10 +57,6 @@ TEST_F(HomeCardTest, AppSelection) {
       athena::ActivityFactory::Get()->CreateWebActivity(
           NULL, GURL("http://www.google.com/")));
   EXPECT_EQ(HomeCard::VISIBLE_MINIMIZED, HomeCard::Get()->GetState());
-
-  // Overview mode has to finish before ending test, otherwise it crashes.
-  // TODO(mukai): fix this.
-  WindowManager::GetInstance()->ToggleOverview();
 }
 
 TEST_F(HomeCardTest, Accelerators) {
@@ -84,10 +80,6 @@ TEST_F(HomeCardTest, Accelerators) {
   EXPECT_EQ(HomeCard::VISIBLE_CENTERED, HomeCard::Get()->GetState());
   generator.PressKey(ui::VKEY_L, ui::EF_CONTROL_DOWN);
   EXPECT_EQ(HomeCard::VISIBLE_CENTERED, HomeCard::Get()->GetState());
-
-  // Overview mode has to finish before ending test, otherwise it crashes.
-  // TODO(mukai): fix this.
-  WindowManager::GetInstance()->ToggleOverview();
 }
 
 }  // namespace athena
diff --git a/athena/wm/window_manager_impl.cc b/athena/wm/window_manager_impl.cc
index 4bb04501..12e907f 100644
--- a/athena/wm/window_manager_impl.cc
+++ b/athena/wm/window_manager_impl.cc
@@ -39,6 +39,9 @@ class WindowManagerImpl : public WindowManager,
     COMMAND_TOGGLE_OVERVIEW,
   };
 
+  // Sets whether overview mode is active.
+  void SetInOverview(bool active);
+
   void InstallAccelerators();
 
   // WindowManager:
@@ -112,6 +115,7 @@ WindowManagerImpl::~WindowManagerImpl() {
 void WindowManagerImpl::Layout() {
   if (!container_)
     return;
+  SetInOverview(false);
   gfx::Rect bounds = gfx::Rect(container_->bounds().size());
   const aura::Window::Windows& children = container_->children();
   for (aura::Window::Windows::const_iterator iter = children.begin();
@@ -124,14 +128,22 @@ void WindowManagerImpl::Layout() {
 }
 
 void WindowManagerImpl::ToggleOverview() {
-  if (overview_) {
-    overview_.reset();
-    FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
-                      OnOverviewModeExit());
-  } else {
+  SetInOverview(overview_.get() == NULL);
+}
+
+void WindowManagerImpl::SetInOverview(bool active) {
+  bool in_overview = !!overview_;
+  if (active == in_overview)
+    return;
+
+  if (active) {
     overview_ = WindowOverviewMode::Create(container_.get(), this);
     FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
                       OnOverviewModeEnter());
+  } else {
+    overview_.reset();
+    FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
+                      OnOverviewModeExit());
   }
 }
 
@@ -156,9 +168,7 @@ void WindowManagerImpl::OnSelectWindow(aura::Window* window) {
   CHECK_EQ(container_.get(), window->parent());
   container_->StackChildAtTop(window);
   wm::ActivateWindow(window);
-  overview_.reset();
-  FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
-                    OnOverviewModeExit());
+  SetInOverview(false);
 }
 
 void WindowManagerImpl::OnWindowDestroying(aura::Window* window) {