[cheese] Maintain aspect ratio when resizing preview window

[David King <davidk src gnome org>]

commit 4b0384c1bd08a5bd95f9ffa83ac8bae95e2cf1a8
Author: David King <amigadave amigadave com>
Date:   Mon Sep 14 11:44:38 2015 +0100

    Maintain aspect ratio when resizing preview window
    
    Set content-gravity on the preview actor to
    CLUTTER_CONTENT_GRAVITY_RESIZE_ASPECT.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=754988

 data/cheese-viewport.json |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/data/cheese-viewport.json b/data/cheese-viewport.json
index cba5d8b..312a2b6 100644
--- a/data/cheese-viewport.json
+++ b/data/cheese-viewport.json
@@ -3,7 +3,8 @@
   "id": "video_preview",
   "type": "ClutterActor",
   "child::x-align": "CLUTTER_BIN_ALIGNMENT_CENTER",
-  "child::y-align": "CLUTTER_BIN_ALIGNMENT_CENTER"
+  "child::y-align": "CLUTTER_BIN_ALIGNMENT_CENTER",
+  "content-gravity": "CLUTTER_CONTENT_GRAVITY_RESIZE_ASPECT"
 },
 {
   "id": "background",