Allow updating arc widget bounds in maximize/fullscreen state.

ash/common/wm/maximize_mode/maximize_mode_window_state.cc

Index: ash/common/wm/maximize_mode/maximize_mode_window_state.cc
diff --git a/ash/common/wm/maximize_mode/maximize_mode_window_state.cc b/ash/common/wm/maximize_mode/maximize_mode_window_state.cc
index a8aa2305a6f6b3c30736263d53693017633aab88..31e6a0cc84dfcadf18846254320a84a02e722ee1 100644
--- a/ash/common/wm/maximize_mode/maximize_mode_window_state.cc
+++ b/ash/common/wm/maximize_mode/maximize_mode_window_state.cc
@@ -163,6 +163,12 @@ void MaximizeModeWindowState::OnWMEvent(wm::WindowState* window_state,
     case wm::WM_EVENT_SHOW_INACTIVE:
       return;
     case wm::WM_EVENT_SET_BOUNDS:
+      if (window_state->allow_set_bounds_in_maximized()) {
+        window_state->SetBoundsConstrained(
+            static_cast<const wm::SetBoundsEvent*>(event)->requested_bounds());
+        break;
+      }
+
       if (current_state_type_ == wm::WINDOW_STATE_TYPE_MAXIMIZED) {
         // Having a maximized window, it could have been created with an empty
         // size and the caller should get his size upon leaving the maximized