Fix the full screen switching browser window dipping below launcher bar issue.

ash/wm/workspace_controller.cc

Index: ash/wm/workspace_controller.cc
diff --git a/ash/wm/workspace_controller.cc b/ash/wm/workspace_controller.cc
index 77868fc0dfb61c06f9755314ddf15e48e88183f3..c613580ae4b270f7785d8648e896b6b51aed346f 100644
--- a/ash/wm/workspace_controller.cc
+++ b/ash/wm/workspace_controller.cc
@@ -73,6 +73,10 @@ void WorkspaceController::OnRootWindowResized(const gfx::Size& new_size) {
   workspace_manager_->SetWorkspaceSize(new_size);
 }
 
+void WorkspaceController::OnScreenWorkAreaInsetsChanged() {
+  workspace_manager_->OnScreenWorkAreaInsetsChanged();
+}
+
 void WorkspaceController::OnWindowPropertyChanged(aura::Window* window,
                                                   const void* key,
                                                   intptr_t old) {