mash: Preliminary support for widget hit test masks

components/mus/public/cpp/lib/window_tree_client_impl.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/public/cpp/lib/window_tree_client_impl.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 295 matching lines @@
 void WindowTreeClientImpl::SetClientArea(
     Id window_id,
     const gfx::Insets& client_area,
     const std::vector<gfx::Rect>& additional_client_areas) {
   DCHECK(tree_);
   tree_->SetClientArea(
       window_id, mojo::Insets::From(client_area),
       mojo::Array<mojo::RectPtr>::From(additional_client_areas));
 }
 
+void WindowTreeClientImpl::SetHitTestMask(Id window_id, const gfx::Rect& mask) {
+  DCHECK(tree_);
+  tree_->SetHitTestMask(window_id, mojo::Rect::From(mask));
+}
+
 void WindowTreeClientImpl::SetFocus(Window* window) {
   // In order for us to get here we had to have exposed a window, which implies
   // we got a connection.
   DCHECK(tree_);
   const uint32_t change_id = ScheduleInFlightChange(
       base::WrapUnique(new InFlightFocusChange(this, focused_window_)));
   tree_->SetFocus(change_id, window ? server_id(window) : 0);
   LocalSetFocus(window);
 }
 
@@ skipping 802 matching lines @@
     const gfx::Vector2d& offset,
     const gfx::Insets& hit_area) {
   if (window_manager_internal_client_) {
     window_manager_internal_client_->SetUnderlaySurfaceOffsetAndExtendedHitArea(
         server_id(window), offset.x(), offset.y(),
         mojo::Insets::From(hit_area));
   }
 }
 
 }  // namespace mus