exo: Fix dragging edge cases

components/exo/wm_helper.cc

Index: components/exo/wm_helper.cc
diff --git a/components/exo/wm_helper.cc b/components/exo/wm_helper.cc
index 517a4ae414518b419f024c780dee897db8cef52a..e5191ed9dcb2876a8d3d50765942ceb5d91f0553 100644
--- a/components/exo/wm_helper.cc
+++ b/components/exo/wm_helper.cc
@@ -54,12 +54,12 @@ void WMHelper::RemoveCursorObserver(CursorObserver* observer) {
   cursor_observers_.RemoveObserver(observer);
 }
 
-void WMHelper::AddMaximizeModeObserver(MaximizeModeObserver* observer) {
-  maximize_mode_observers_.AddObserver(observer);
+void WMHelper::AddShellObserver(ShellObserver* observer) {
+  shell_observers_.AddObserver(observer);
 }
 
-void WMHelper::RemoveMaximizeModeObserver(MaximizeModeObserver* observer) {
-  maximize_mode_observers_.RemoveObserver(observer);
+void WMHelper::RemoveShellObserver(ShellObserver* observer) {
+  shell_observers_.RemoveObserver(observer);
 }
 
 void WMHelper::AddAccessibilityObserver(AccessibilityObserver* observer) {
@@ -72,39 +72,49 @@ void WMHelper::RemoveAccessibilityObserver(AccessibilityObserver* observer) {
 
 void WMHelper::NotifyWindowActivated(aura::Window* gained_active,
                                      aura::Window* lost_active) {
-  FOR_EACH_OBSERVER(ActivationObserver, activation_observers_,
-                    OnWindowActivated(gained_active, lost_active));
+  for (ActivationObserver& observer : activation_observers_)
+    observer.OnWindowActivated(gained_active, lost_active);
 }
 
 void WMHelper::NotifyWindowFocused(aura::Window* gained_focus,
                                    aura::Window* lost_focus) {
-  FOR_EACH_OBSERVER(FocusObserver, focus_observers_,
-                    OnWindowFocused(gained_focus, lost_focus));
+  for (FocusObserver& observer : focus_observers_)
+    observer.OnWindowFocused(gained_focus, lost_focus);
 }
 
 void WMHelper::NotifyCursorVisibilityChanged(bool is_visible) {
-  FOR_EACH_OBSERVER(CursorObserver, cursor_observers_,
-                    OnCursorVisibilityChanged(is_visible));
+  for (CursorObserver& observer : cursor_observers_)
+    observer.OnCursorVisibilityChanged(is_visible);
 }
 
 void WMHelper::NotifyCursorSetChanged(ui::CursorSetType cursor_set) {
-  FOR_EACH_OBSERVER(CursorObserver, cursor_observers_,
-                    OnCursorSetChanged(cursor_set));
+  for (CursorObserver& observer : cursor_observers_)
+    observer.OnCursorSetChanged(cursor_set);
 }
 
 void WMHelper::NotifyMaximizeModeStarted() {
-  FOR_EACH_OBSERVER(MaximizeModeObserver, maximize_mode_observers_,
-                    OnMaximizeModeStarted());
+  for (ShellObserver& observer : shell_observers_)
+    observer.OnMaximizeModeStarted();
 }
 
 void WMHelper::NotifyMaximizeModeEnded() {
-  FOR_EACH_OBSERVER(MaximizeModeObserver, maximize_mode_observers_,
-                    OnMaximizeModeEnded());
+  for (ShellObserver& observer : shell_observers_)
+    observer.OnMaximizeModeEnded();
+}
+
+void WMHelper::NotifyOverviewModeStarted() {
+  for (ShellObserver& observer : shell_observers_)
+    observer.OnOverviewModeStarted();
+}
+
+void WMHelper::NotifyOverviewModeEnded() {
+  for (ShellObserver& observer : shell_observers_)
+    observer.OnOverviewModeEnded();
 }
 
 void WMHelper::NotifyAccessibilityModeChanged() {
-  FOR_EACH_OBSERVER(AccessibilityObserver, accessibility_observers_,
-                    OnAccessibilityModeChanged());
+  for (AccessibilityObserver& observer : accessibility_observers_)
+    observer.OnAccessibilityModeChanged();
 }
 
 }  // namespace exo