mash: Preliminary support for widget hit test masks

components/mus/ws/event_dispatcher_unittest.cc

 // Copyright 2015 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/event_dispatcher.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
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   event_dispatcher()->ProcessEvent(press_event);
 
   // Events should target child and be in the client area.
   std::unique_ptr<DispatchedEventDetails> details =
       event_dispatcher_delegate->GetAndAdvanceDispatchedEventDetails();
   EXPECT_FALSE(event_dispatcher_delegate->has_queued_events());
   ASSERT_EQ(child.get(), details->window);
   EXPECT_FALSE(details->in_nonclient_area);
 }
 
+TEST_F(EventDispatcherTest, HitTestMask) {
+  std::unique_ptr<ServerWindow> child = CreateChildWindow(WindowId(1, 3));
+
+  root_window()->SetBounds(gfx::Rect(0, 0, 100, 100));
+  child->SetBounds(gfx::Rect(10, 10, 20, 20));
+  child->set_hit_test_mask(gfx::Rect(2, 2, 16, 16));
+
+  // Press in the masked out area.
+  const ui::PointerEvent press_event(ui::MouseEvent(
+      ui::ET_MOUSE_PRESSED, gfx::Point(11, 11), gfx::Point(11, 11),
+      base::TimeDelta(), ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON));
+  event_dispatcher()->ProcessEvent(press_event);
+
+  // Event went through the child window and hit the root.
+  std::unique_ptr<DispatchedEventDetails> details =
+      test_event_dispatcher_delegate()->GetAndAdvanceDispatchedEventDetails();
+  EXPECT_EQ(root_window(), details->window);
+  EXPECT_FALSE(details->in_nonclient_area);
+}
+
 TEST_F(EventDispatcherTest, DontFocusOnSecondDown) {
   std::unique_ptr<ServerWindow> child1 = CreateChildWindow(WindowId(1, 3));
   std::unique_ptr<ServerWindow> child2 = CreateChildWindow(WindowId(1, 4));
 
   root_window()->SetBounds(gfx::Rect(0, 0, 100, 100));
   child1->SetBounds(gfx::Rect(10, 10, 20, 20));
   child2->SetBounds(gfx::Rect(50, 51, 11, 12));
 
   TestEventDispatcherDelegate* event_dispatcher_delegate =
       test_event_dispatcher_delegate();
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   // Remove the last remaining system modal window. There should be no active
   // one anymore.
   w3.reset();
   EXPECT_EQ(nullptr, GetActiveSystemModalWindow());
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace mus