Mojo multiple command buffer support and sample

mojo/examples/surfaces_app/embedder.h

Index: mojo/examples/surfaces_app/embedder.h
diff --git a/mojo/examples/surfaces_app/embedder.h b/mojo/examples/surfaces_app/embedder.h
index 56212f3311ec87032940c92e340cfdc6284d24fb..3be6a4264b5885e84e49c80738c25d12478b003c 100644
--- a/mojo/examples/surfaces_app/embedder.h
+++ b/mojo/examples/surfaces_app/embedder.h
@@ -31,7 +31,7 @@ class Embedder {
                     cc::SurfaceId child_two,
                     const gfx::Size& child_size,
                     const gfx::Size& size,
-                    double rotation_degrees);
+                    int offset);
 
  private:
   cc::SurfaceId id_;