Mojom interface for Surfaces service

mojo/services/public/interfaces/geometry/geometry.mojom

Index: mojo/services/public/interfaces/geometry/geometry.mojom
diff --git a/mojo/services/public/interfaces/geometry/geometry.mojom b/mojo/services/public/interfaces/geometry/geometry.mojom
index 62cedddf16ba1ba3c1335dc5d5cb9d4c2fc6fe7c..ab68c8e61ce279c8915824a775fe1c8f3ccccea4 100644
--- a/mojo/services/public/interfaces/geometry/geometry.mojom
+++ b/mojo/services/public/interfaces/geometry/geometry.mojom
@@ -9,6 +9,11 @@ struct Point {
   int32 y;
 };
 
+struct PointF {
+  float x;
+  float y;
+};
+
 struct Size {
   int32 width;
   int32 height;
@@ -21,4 +26,9 @@ struct Rect {
   int32 height;
 };
 
+struct Transform {
+  // Should have exactly 16 entries.
+  float[] matrix;
+};
+
 }