Mojo C++ bindings: support mapping T and T? differently.

services/ui/ws/scheduled_animation_group.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 "services/ui/ws/scheduled_animation_group.h"
 
 #include <set>
 
 #include "services/ui/ws/server_window.h"
 
@@ skipping 71 matching lines @@
       return gfx::Tween::EASE_OUT;
     case mojom::AnimationTweenType::EASE_IN_OUT:
       return gfx::Tween::EASE_IN_OUT;
   }
   return gfx::Tween::LINEAR;
 }
 
 void ConvertToScheduledValue(const mojom::AnimationValue& transport_value,
                              ScheduledAnimationValue* value) {
   value->float_value = transport_value.float_value;
-  value->transform = transport_value.transform;
+  value->transform =
+      transport_value.transform ? *transport_value.transform : gfx::Transform();
 }
 
 void ConvertToScheduledElement(const mojom::AnimationElement& transport_element,
                                ScheduledAnimationElement* element) {
   element->property = transport_element.property;
   element->duration =
       base::TimeDelta::FromMicroseconds(transport_element.duration);
   element->tween_type = AnimationTypeToTweenType(transport_element.tween_type);
   if (transport_element.property != AnimationProperty::NONE) {
     if (transport_element.start_value.get()) {
@@ skipping 244 matching lines @@
   return sequences_.empty();
 }
 
 ScheduledAnimationGroup::ScheduledAnimationGroup(ServerWindow* window,
                                                  uint32_t id,
                                                  base::TimeTicks time_scheduled)
     : window_(window), id_(id), time_scheduled_(time_scheduled) {}
 
 }  // namespace ws
 }  // namespace ui