Bug 1152977 - Enable by default DEAA for desktop platforms that use OpenGL compositor. r=jmuizelaar

- DEAA is enabled by default for the OpenGL compositor.  This will take
  immediate effect on OSX and will be effective in Linux once the OpenGL
  compositor is enabled by default in Linux.

--HG--
extra : rebase_source : 5da3a43ce922f9fa05442939ce8a66ce6c72d647

modules/libpref/init/all.js

@@ -4156,7 +4156,13 @@ pref("layers.acceleration.force-enabled", false);
 pref("layers.acceleration.draw-fps", false);
 
 // Enable DEAA antialiasing for transformed layers in the compositor
+#if !defined(MOZ_WIDGET_GONK) && !defined(MOZ_WIDGET_ANDROID)
+// Desktop prefs
+pref("layers.deaa.enabled", true);
+#else
+// Mobile prefs
 pref("layers.deaa.enabled", false);
+#endif
 
 pref("layers.dump", false);
 #ifdef MOZ_DUMP_PAINTING