Make WindowTree::SetModal() take the type.

services/ui/public/interfaces/window_tree.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module ui.mojom;
 
 import "cc/ipc/surface_info.mojom";
 import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "services/ui/public/interfaces/cursor.mojom";
 import "services/ui/public/interfaces/event_matcher.mojom";
 import "services/ui/public/interfaces/mus_constants.mojom";
 import "services/ui/public/interfaces/window_manager.mojom";
 import "services/ui/public/interfaces/window_manager_constants.mojom";
 import "services/ui/public/interfaces/window_tree_constants.mojom";
+import "ui/base/mojo/ui_base_types.mojom";
 import "ui/events/mojo/event.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "ui/platform_window/mojo/text_input_state.mojom";
 
 // Windows are identified by a uint32. The upper 16 bits are the connection id,
 // and the lower 16 the id assigned by the client.
 //
 // The root window is identified with a connection id of 0, and value of 1.
 //
 // Most functions to the WindowTree take a change_id parameter. When
@@ skipping 144 matching lines @@
   // . |transient_window_id| is an ancestor of |window_id|.
   // . |transient_window_id| is modal to system.
   AddTransientWindow(uint32 change_id,
                      uint32 window_id,
                      uint32 transient_window_id);
 
   // Decouples the lifetime of |transient_window_id| from its transient parent.
   // This does not change transient window's position in the window hierarchy.
   RemoveTransientWindowFromParent(uint32 change_id, uint32 transient_window_id);
 
-  // Sets |window_id| to be modal. If the window has a transient parent, then
-  // the window is modal to the transient parent. Otherwise, the window is modal
-  // to the system. This releases capture if necessary.
+  // Changes modality type of |window_id|. This releases capture if necessary.
   // This fails for any of the following reasons:
   // . |window_id| does not identify a valid window.
   // . Client does not have a valid user id (i.e., it is an embedded app).
-  SetModal(uint32 change_id, uint32 window_id);
+  SetModalType(uint32 change_id, uint32 window_id, ModalType type);
 
   // Reorders a window in its parent, relative to |relative_window_id| according
   // to |direction|. Only the connection that created the window's parent can
   // reorder its children.
   ReorderWindow(uint32 change_id,
                 uint32 window_id,
                 uint32 relative_window_id,
                 OrderDirection direction);
 
   // Returns the windows comprising the tree starting at |window_id|.
@@ skipping 305 matching lines @@
   // See description of WindowManager for details.
   GetWindowManager(associated WindowManager& internal);
 };
 
 // Mus provides this interface as a way for clients to connect and obtain a
 // WindowTree handle with a supplied WindowTreeClient handle. The
 // WindowTreeClient has no roots, use NewTopLevelWindow() to create one.
 interface WindowTreeFactory {
   CreateWindowTree(WindowTree& tree_request, WindowTreeClient client);
 };