Bug 968495 - Increase frequency for repainting while panning. r=vingtetun

b2g/app/b2g.js

@@ -874,6 +874,7 @@ pref("identity.fxaccounts.auth.uri", "https://api-accounts.dev.lcip.org/v1");
 // Gaia relies heavily on scroll events for now, so lets fire them
 // more often than the default value (100).
 pref("apz.asyncscroll.throttle", 40);
+pref("apz.pan_repaint_interval", 40);
 
 // This preference allows FirefoxOS apps (and content, I think) to force
 // the use of software (instead of hardware accelerated) 2D canvases by