Add window states docked; and docked minimized. Add wm window event to set docked and undocked.

ash/wm/dock/docked_window_layout_manager.cc

Index: ash/wm/dock/docked_window_layout_manager.cc
diff --git a/ash/wm/dock/docked_window_layout_manager.cc b/ash/wm/dock/docked_window_layout_manager.cc
index 71316611fa93b1e92f884833680b1c3063375b7d..4e50ccfbacff55d294e24fe524971937b9b92483 100644
--- a/ash/wm/dock/docked_window_layout_manager.cc
+++ b/ash/wm/dock/docked_window_layout_manager.cc
@@ -826,15 +826,16 @@ void DockedWindowLayoutManager::OnPreWindowStateTypeChange(
   // until OnFullscreenStateChange is called when exiting fullscreen.
   if (in_fullscreen_)
     return;
-  if (window_state->IsMinimized()) {
-    MinimizeDockedWindow(window_state);
-  } else if (window_state->IsMaximizedOrFullscreen() ||
-             window_state->IsSnapped()) {
+  if (!window_state->IsDocked() ||
+      window_state->IsMaximizedOrFullscreen() ||
+      window_state->IsSnapped()) {
     if (window != dragged_window_) {
       UndockWindow(window);
       RecordUmaAction(DOCKED_ACTION_MAXIMIZE, DOCKED_ACTION_SOURCE_UNKNOWN);
     }
-  } else if (old_type == wm::WINDOW_STATE_TYPE_MINIMIZED) {
+  } else if (window_state->IsMinimized()) {
+    MinimizeDockedWindow(window_state);
+  } else if (old_type == wm::WINDOW_STATE_TYPE_DOCKED_MINIMIZED) {

[varkha, 2014/09/23 22:35:31]

Maybe add NOTREACHED for WINDOW_STATE_TYPE_MINIMIZED if it is impossible now.

[dtapuska, 2014/09/26 14:17:07]

Done.

     RestoreDockedWindow(window_state);
   }
 }