CPP bindings: DCHECK when a Callback is destructed without being invoked

services/view_manager/view_manager_service_apptest.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 "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/application_test_base.h"
@@ skipping 315 matching lines @@
   void OnViewVisibilityChanged(uint32_t view, bool visible) override {
     tracker()->OnViewVisibilityChanged(view, visible);
   }
   void OnViewDrawnStateChanged(uint32_t view, bool drawn) override {
     tracker()->OnViewDrawnStateChanged(view, drawn);
   }
   void OnViewInputEvent(Id view_id,
                         EventPtr event,
                         const Callback<void()>& callback) override {
     tracker()->OnViewInputEvent(view_id, event.Pass());
+    callback.Run();
   }
   void OnViewSharedPropertyChanged(uint32_t view,
                                    const String& name,
                                    Array<uint8_t> new_data) override {
     tracker_.OnViewSharedPropertyChanged(view, name, new_data.Pass());
   }
   void OnPerformAction(uint32_t view,
                        const String& name,
                        const Callback<void(bool)>& callback) override {}
 
@@ skipping 1143 matching lines @@
 // TODO(sky): need to better track changes to initial connection. For example,
 // that SetBounsdViews/AddView and the like don't result in messages to the
 // originating connection.
 
 // TODO(sky): make sure coverage of what was
 // ViewManagerTest.SecondEmbedRoot_InitService and
 // ViewManagerTest.MultipleEmbedRootsBeforeWTHReady gets added to window manager
 // tests.
 
 }  // namespace view_manager