Defer maximize mode bounds updates until after exiting overview.

ash/wm/maximize_mode/maximize_mode_window_manager.cc

Index: ash/wm/maximize_mode/maximize_mode_window_manager.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_window_manager.cc b/ash/wm/maximize_mode/maximize_mode_window_manager.cc
index 2e9f042970907350d2ae11748c3eb9a8215660df..6b7fc369ea22b25e7eef9b4ee83e126987419f4f 100644
--- a/ash/wm/maximize_mode/maximize_mode_window_manager.cc
+++ b/ash/wm/maximize_mode/maximize_mode_window_manager.cc
@@ -81,6 +81,7 @@ void MaximizeModeWindowManager::OnOverviewModeStarting() {
     return;
 
   EnableBackdropBehindTopWindowOnEachDisplay(false);
+  SetDeferBoundsUpdates(true);
   backdrops_hidden_ = true;
 }
 
@@ -90,6 +91,7 @@ void MaximizeModeWindowManager::OnOverviewModeEnding() {
 
   backdrops_hidden_ = false;
   EnableBackdropBehindTopWindowOnEachDisplay(true);
+  SetDeferBoundsUpdates(false);
 }
 
 void MaximizeModeWindowManager::OnWindowDestroying(aura::Window* window) {
@@ -194,6 +196,15 @@ void MaximizeModeWindowManager::RestoreAllWindows() {
     ForgetWindow(window_state_map_.begin()->first);
 }
 
+void MaximizeModeWindowManager::SetDeferBoundsUpdates(
+    bool defer_bounds_updates) {
+  for (WindowToState::iterator it = window_state_map_.begin();
+       it != window_state_map_.end();
+       ++it) {
+    it->second->SetDeferBoundsUpdates(defer_bounds_updates);
+  }
+}
+
 void MaximizeModeWindowManager::MaximizeAndTrackWindow(
     aura::Window* window) {
   if (!ShouldHandleWindow(window))