Create mojom and StructTraits for ui/display/types/display_mode.cc

ui/display/types/display_mode.cc

Index: ui/display/types/display_mode.cc
diff --git a/ui/display/types/display_mode.cc b/ui/display/types/display_mode.cc
index 6d43caa5638406c5e43a4b7003d0e491db066715..5ce848acdb588eeb5a6a12d3989ce91b94286ef8 100644
--- a/ui/display/types/display_mode.cc
+++ b/ui/display/types/display_mode.cc
@@ -9,6 +9,9 @@
 
 namespace display {
 
+DisplayMode::DisplayMode()
+    : size_(gfx::Size()), is_interlaced_(false), refresh_rate_(0.0) {}
+
 DisplayMode::DisplayMode(const gfx::Size& size,
                          bool interlaced,
                          float refresh_rate)
@@ -16,7 +19,11 @@ DisplayMode::DisplayMode(const gfx::Size& size,
       is_interlaced_(interlaced),
       refresh_rate_(refresh_rate) {}
 
-DisplayMode::~DisplayMode() {}
+DisplayMode::DisplayMode(DisplayMode&&) = default;
+
+DisplayMode& DisplayMode::operator=(DisplayMode&&) = default;
+
+DisplayMode::~DisplayMode() = default;
 
 std::unique_ptr<DisplayMode> DisplayMode::Clone() const {
   return base::WrapUnique(new DisplayMode(size_,