Undocks window first before side-snapping bounds

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index b4acff9187012dc3fe59c6faa328beceacb9b2d2..cc92fa5384989671a461197184fc2ff59757c7b6 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -841,7 +841,7 @@ bool AcceleratorController::PerformAction(int action,
     case WINDOW_SNAP_LEFT:
     case WINDOW_SNAP_RIGHT: {
       wm::WindowState* window_state = wm::GetActiveWindowState();
-      // Disable window docking shortcut key for full screen window due to
+      // Disable window snapping shortcut key for full screen window due to
       // http://crbug.com/135487.
       if (!window_state ||
           window_state->window()->type() != aura::client::WINDOW_TYPE_NORMAL ||
@@ -870,7 +870,10 @@ bool AcceleratorController::PerformAction(int action,
     }
     case WINDOW_POSITION_CENTER: {
       aura::Window* window = wm::GetActiveWindow();
-      if (window) {
+      // Centering a window does not maintain state and state change
+      // notifications are not sent. Disable centering for docked windows.
+      if (window && !wm::GetWindowState(window)->IsDocked()) {
+        wm::GetWindowState(window)->SetWindowShowTypeUnsnapped();
         wm::CenterWindow(window);
         return true;
       }