Change mojo geometry structs from using type converters to StructTraits.

components/mus/ws/test_change_tracker.cc

Index: components/mus/ws/test_change_tracker.cc
diff --git a/components/mus/ws/test_change_tracker.cc b/components/mus/ws/test_change_tracker.cc
index 953d66a062fa7ed80ed941adb6c126d810054e4c..5779d65a8052155938998c28d720e841e5c164c1 100644
--- a/components/mus/ws/test_change_tracker.cc
+++ b/components/mus/ws/test_change_tracker.cc
@@ -25,11 +25,6 @@ std::string WindowIdToString(Id id) {
 
 namespace {
 
-std::string RectToString(const mojo::Rect& rect) {
-  return base::StringPrintf("%d,%d %dx%d", rect.x, rect.y, rect.width,
-                            rect.height);
-}
-
 std::string DirectionToString(mojom::OrderDirection direction) {
   return direction == mojom::OrderDirection::ABOVE ? "above" : "below";
 }
@@ -69,8 +64,7 @@ std::string ChangeToDescription(const Change& change,
       return base::StringPrintf(
           "BoundsChanged window=%s old_bounds=%s new_bounds=%s",
           WindowIdToString(change.window_id).c_str(),
-          RectToString(change.bounds).c_str(),
-          RectToString(change.bounds2).c_str());
+          change.bounds.ToString().c_str(), change.bounds2.ToString().c_str());
 
     case CHANGE_TYPE_NODE_HIERARCHY_CHANGED:
       return base::StringPrintf(
@@ -256,19 +250,13 @@ void TestChangeTracker::OnEmbeddedAppDisconnected(Id window_id) {
 }
 
 void TestChangeTracker::OnWindowBoundsChanged(Id window_id,
-                                              mojo::RectPtr old_bounds,
-                                              mojo::RectPtr new_bounds) {
+                                              const gfx::Rect& old_bounds,
+                                              const gfx::Rect& new_bounds) {
   Change change;
   change.type = CHANGE_TYPE_NODE_BOUNDS_CHANGED;
   change.window_id = window_id;
-  change.bounds.x = old_bounds->x;
-  change.bounds.y = old_bounds->y;
-  change.bounds.width = old_bounds->width;
-  change.bounds.height = old_bounds->height;
-  change.bounds2.x = new_bounds->x;
-  change.bounds2.y = new_bounds->y;
-  change.bounds2.width = new_bounds->width;
-  change.bounds2.height = new_bounds->height;
+  change.bounds = old_bounds;
+  change.bounds2 = new_bounds;
   AddChange(change);
 }