mash: Preliminary support for widget hit test masks

components/mus/ws/window_tree.cc

 // 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.
 
 #include "components/mus/ws/window_tree.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 1283 matching lines @@
   ServerWindow* window =
       GetWindowByClientId(ClientWindowId(transport_window_id));
   if (!window || !access_policy_->CanSetClientArea(window))
     return;
 
   std::vector<gfx::Rect> additional_client_areas =
       transport_additional_client_areas.To<std::vector<gfx::Rect>>();
   window->SetClientArea(insets.To<gfx::Insets>(), additional_client_areas);
 }
 
+void WindowTree::SetHitTestMask(Id transport_window_id, mojo::RectPtr mask) {
+  ServerWindow* window =
+      GetWindowByClientId(ClientWindowId(transport_window_id));
+  if (!window || !access_policy_->CanSetHitTestMask(window)) {
+    DVLOG(1) << "SetHitTestMask failed";
+    return;
+  }
+
+  if (mask)
+    window->SetHitTestMask(mask.To<gfx::Rect>());
+  else
+    window->ClearHitTestMask();
+}
+
 void WindowTree::Embed(Id transport_window_id,
                        mojom::WindowTreeClientPtr client,
                        const EmbedCallback& callback) {
   callback.Run(Embed(ClientWindowId(transport_window_id), std::move(client)));
 }
 
 void WindowTree::SetFocus(uint32_t change_id, Id transport_window_id) {
   client()->OnChangeCompleted(change_id,
                               SetFocus(ClientWindowId(transport_window_id)));
 }
@@ skipping 151 matching lines @@
 }
 
 bool WindowTree::IsWindowRootOfAnotherTreeForAccessPolicy(
     const ServerWindow* window) const {
   WindowTree* tree = window_server_->GetTreeWithRoot(window);
   return tree && tree != this;
 }
 
 }  // namespace ws
 }  // namespace mus