Decoupling visibility states from webcontent, adding visibility management in ResourceManager

athena/home/home_card_impl.cc

Index: athena/home/home_card_impl.cc
diff --git a/athena/home/home_card_impl.cc b/athena/home/home_card_impl.cc
index 1dfadf0ba02c74fb7b4da4e911b003dfabb4fcd7..745bd063d4e75867abe9a0f79b8f8e84f789d482 100644
--- a/athena/home/home_card_impl.cc
+++ b/athena/home/home_card_impl.cc
@@ -421,7 +421,10 @@ void HomeCardImpl::OnOverviewModeExit() {
   SetState(VISIBLE_MINIMIZED);
 }
 
-void HomeCardImpl::OnActivityOrderHasChanged() {
+void HomeCardImpl::OnSplitViewModeEnter() {
+}
+
+void HomeCardImpl::OnSplitViewModeExit() {
 }
 
 void HomeCardImpl::OnWindowActivated(aura::Window* gained_active,