Converts DockedWindowLayoutManager to common ash/wm types

ash/wm/common/wm_root_window_controller.h

Index: ash/wm/common/wm_root_window_controller.h
diff --git a/ash/wm/common/wm_root_window_controller.h b/ash/wm/common/wm_root_window_controller.h
index e247c0888b6fb11012b7a84df5b7fa414bffdb78..ec0ba56869f28e38b5df30f76082af7680d751ee 100644
--- a/ash/wm/common/wm_root_window_controller.h
+++ b/ash/wm/common/wm_root_window_controller.h
@@ -9,6 +9,7 @@
 
 #include "ash/ash_export.h"
 #include "ash/wm/common/workspace/workspace_types.h"
+#include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace wm {
@@ -31,6 +32,13 @@ class ASH_EXPORT WmRootWindowController {
 
   // Returns the window associated with this WmRootWindowController.
   virtual WmWindow* GetWindow() = 0;
+
+  // Configures |init_params| prior to initializing |widget|.
+  // |shell_container_id| is the id of the container to parent |widget| to.
+  virtual void ConfigureWidgetInitParamsForContainer(
+      views::Widget* widget,
+      int shell_container_id,
+      views::Widget::InitParams* init_params) = 0;
 };
 
 }  // namespace wm