IPC::ParamTraits for ui::Event (towards ui::Events over mojo IPC)

ui/events/gesture_event_details.h

Index: ui/events/gesture_event_details.h
diff --git a/ui/events/gesture_event_details.h b/ui/events/gesture_event_details.h
index ff88041fb3eeb38819000f8072b2624938f38aab..f889e0d88a7bf921cff09e9a58074340b3340d26 100644
--- a/ui/events/gesture_event_details.h
+++ b/ui/events/gesture_event_details.h
@@ -5,7 +5,10 @@
 #ifndef UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 
+#include <string.h>
+
 #include "base/logging.h"
+#include "ipc/ipc_message_utils.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/events_base_export.h"
 #include "ui/gfx/geometry/rect.h"
@@ -182,11 +185,24 @@ struct EVENTS_BASE_EXPORT GestureEventDetails {
     int tap_count;  // TAP repeat count.
   } data_;
 
+  // For mojo native implementation of (de)serialization.
+  friend struct IPC::ParamTraits<ui::GestureEventDetails>;
+  friend struct IPC::ParamTraits<ui::GestureEventDetails::Details>;
+
   int touch_points_;  // Number of active touch points in the gesture.
 
   // Bounding box is an axis-aligned rectangle that contains all the
   // enclosing rectangles of the touch-points in the gesture.
   gfx::RectF bounding_box_;
+
+ public:
+  // Supports comparison over internal structures for testing.

[Tom Sepez, 2016/02/18 18:46:10]

nit: move up to public section.

[Mark Dittmer, 2016/02/18 19:12:56]

Done.

+  bool operator==(const GestureEventDetails& other) const {
+    return type_ == other.type_ &&
+           !memcmp(&data_, &other.data_, sizeof(Details)) &&
+           touch_points_ == other.touch_points_ &&
+           bounding_box_ == other.bounding_box_;
+  }
 };
 
 }  // namespace ui