Prevent mouse from getting stuck on second display in login

ash/root_window_controller_unittest.cc

 // Copyright (c) 2012 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 "ash/root_window_controller.h"
 
 #include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 455 matching lines @@
        ++block_reason) {
     BlockUserSession(static_cast<UserSessionBlockReason>(block_reason));
     lock_window->Focus();
     EXPECT_TRUE(lock_window->HasFocus());
     session_window->Focus();
     EXPECT_FALSE(session_window->HasFocus());
     UnblockUserSession();
   }
 }
 
+typedef test::NoSessionAshTestBase NoSessionRootWindowControllerTest;
+
+// Make sure that an event handler exists for entire display area.
+TEST_F(NoSessionRootWindowControllerTest, Event) {
+  aura::RootWindow* root = Shell::GetPrimaryRootWindow();
+  const gfx::Size size = root->bounds().size();
+  aura::Window* event_target = root->GetEventHandlerForPoint(gfx::Point(0, 0));
+  EXPECT_TRUE(event_target);
+  EXPECT_EQ(event_target,
+            root->GetEventHandlerForPoint(gfx::Point(0, size.height() - 1)));
+  EXPECT_EQ(event_target,
+            root->GetEventHandlerForPoint(gfx::Point(size.width() - 1, 0)));
+  EXPECT_EQ(event_target,
+            root->GetEventHandlerForPoint(gfx::Point(0, size.height() - 1)));
+  EXPECT_EQ(event_target,
+            root->GetEventHandlerForPoint(
+                gfx::Point(size.width() - 1, size.height() - 1)));
+}
+
 }  // namespace test
 }  // namespace ash