Move geometry types to a more central location.

mojo/services/native_viewport/native_viewport.mojom

 // Copyright 2013 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.
 
+import "../../public/interfaces/geometry/geometry.mojom"
+
 module mojo {
 
-struct Point {
-  float x;
-  float y;
-};
-
-struct Size {
-  float width;
-  float height;
-};
-
-struct Rect {
-  Point position;
-  Size size;
-};
-
 struct KeyData {
   int32 key_code;
   bool is_char;
 };
 
 struct TouchData {
   int32 pointer_id;
 };
 
 struct Event {
@@ skipping 16 matching lines @@
 };
 
 interface NativeViewportClient {
   OnCreated();
   OnBoundsChanged(Rect bounds);
   OnDestroyed();
   OnEvent(Event event) => ();
 };
 
 }