Mozart: Enhance tile app to test various sync behaviors.

examples/ui/tile/README.md

Index: examples/ui/tile/README.md
diff --git a/examples/ui/tile/README.md b/examples/ui/tile/README.md
index 86ec7a87f73b2370767b63bd6f4670d275455295..4d056182947d3918aac01ab2c15c73c0152d34f7 100644
--- a/examples/ui/tile/README.md
+++ b/examples/ui/tile/README.md
@@ -8,8 +8,31 @@ their Views with the ViewManager for this to work.
 
 ## USAGE
 
-  out/Debug/mojo_shell "mojo:launcher mojo:tile_view?<app1>[,<app2>[,...]]"
+Specify the urls of the views to embed as a comma-delimited query string.
 
-Specify the urls of the views to embed as a comma-delimited query parameter.
+  out/Debug/mojo_shell "mojo:launcher mojo:tile_view?views=<app1>[,<app2>[,...]]"
 
-  eg. out/Debug/mojo_shell "mojo:launcher mojo:tile_view?mojo:spinning_cube_view,mojo:noodles_view"
+  eg. out/Debug/mojo_shell "mojo:launcher mojo:tile_view?views=mojo:spinning_cube_view,mojo:noodles_view"
+
+The query string may also encode tiling options by appending parameters to
+the end of the query string.
+
+  Version mode for child views:
+
+    &vm=any   : composite most recent unblocked version of each child (default)
+    &vm=exact : composite only exact version of child specified during
+                layout (forces frame-level synchronization of resizing)
+
+  Combinator mode for child views:
+
+    &cm=merge : use MERGE combinator (default)
+    &cm=prune : use PRUNE combinator
+    &cm=flash : use FALLBACK combinator with solid red color as
+                alternate content
+    &cm=dim   : use FALLBACK combinator with a dimmed layer containing the
+                most recent unblocked version of the child
+
+  Orientation mode for child views:
+
+    &o=h : tile children horizontally
+    &o=v : tile children vertically