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 ce51cbafdac052eba4432db889fd52efdfe5d04e..787ab601f38a40f246a744d54b601f404e5a12e2 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) {
@@ -102,15 +102,25 @@ void WMHelper::NotifyCursorSetChanged(ui::CursorSetType cursor_set) {
 }
 
 void WMHelper::NotifyMaximizeModeStarted() {
-  for (MaximizeModeObserver& observer : maximize_mode_observers_)
+  for (ShellObserver& observer : shell_observers_)
     observer.OnMaximizeModeStarted();
 }
 
 void WMHelper::NotifyMaximizeModeEnded() {
-  for (MaximizeModeObserver& observer : maximize_mode_observers_)
+  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 (AccessibilityObserver& observer : accessibility_observers_)
     observer.OnAccessibilityModeChanged();