Change mojo geometry structs from using type converters to StructTraits.

ui/mojo/geometry/geometry.mojom

Index: ui/mojo/geometry/geometry.mojom
diff --git a/ui/mojo/geometry/geometry.mojom b/ui/mojo/geometry/geometry.mojom
index 95a433616749216e10d01dc60d1f0e4be67a035f..771e6f4ec9c493d2152466deb34aebf16f043a74 100644
--- a/ui/mojo/geometry/geometry.mojom
+++ b/ui/mojo/geometry/geometry.mojom
@@ -19,6 +19,11 @@ struct Size {
   int32 height;
 };
 
+struct SizeF {
+  int32 width;
+  int32 height;
+};
+
 struct Rect {
   int32 x;
   int32 y;
@@ -44,3 +49,10 @@ struct Insets {
   int32 bottom;
   int32 right;
 };
+
+struct InsetsF {
+  float top;
+  float left;
+  float bottom;
+  float right;
+};