Change behaviour of the Alt-] and Alt-[ keys so that it cycles through SnapLeft/SnapRight to DockLe…

ash/wm/panels/panel_layout_manager.cc

Index: ash/wm/panels/panel_layout_manager.cc
diff --git a/ash/wm/panels/panel_layout_manager.cc b/ash/wm/panels/panel_layout_manager.cc
index bf69c2c06d349518f2533258192adcfcf38e40b6..eec590f0fc520e9ba1043c58c9f2832ed31d2d8e 100644
--- a/ash/wm/panels/panel_layout_manager.cc
+++ b/ash/wm/panels/panel_layout_manager.cc
@@ -487,22 +487,27 @@ void PanelLayoutManager::OnWindowPropertyChanged(aura::Window* window,
 void PanelLayoutManager::OnPostWindowStateTypeChange(
     wm::WindowState* window_state,
     wm::WindowStateType old_type) {
-  // If the shelf is currently hidden then windows will not actually be shown
-  // but the set to restore when the shelf becomes visible is updated.
-  if (restore_windows_on_shelf_visible_) {
-    if (window_state->IsMinimized()) {
-      MinimizePanel(window_state->window());
-      restore_windows_on_shelf_visible_->Remove(window_state->window());
-    } else {
-      restore_windows_on_shelf_visible_->Add(window_state->window());
+  aura::Window* window = window_state->window();
+  if (window_state->IsDocked()) {
+    wm::DockWindow(window);
+  } else {
+    // If the shelf is currently hidden then windows will not actually be shown
+    // but the set to restore when the shelf becomes visible is updated.
+    if (restore_windows_on_shelf_visible_) {
+      if (window_state->IsMinimized()) {
+        MinimizePanel(window_state->window());
+        restore_windows_on_shelf_visible_->Remove(window_state->window());
+      } else {
+        restore_windows_on_shelf_visible_->Add(window_state->window());
+      }
+      return;
     }
-    return;
-  }
 
-  if (window_state->IsMinimized())
-    MinimizePanel(window_state->window());
-  else
-    RestorePanel(window_state->window());
+    if (window_state->IsMinimized())
+      MinimizePanel(window_state->window());
+    else
+      RestorePanel(window_state->window());
+  }
 }
 
 ////////////////////////////////////////////////////////////////////////////////