update slides

BUG=skia:

Review URL: https://codereview.chromium.org/686853005
diff --git a/resources/slides_transitions.lua b/resources/slides_transitions.lua
index 4a838a4..bab3827 100644
--- a/resources/slides_transitions.lua
+++ b/resources/slides_transitions.lua
@@ -39,7 +39,9 @@
 
 function set_blur(paint, alpha)
     local sigma = sqr(1 - alpha) * 20
---    paint:setImageFilter(Sk.newBlurImageFilter(sigma, sigma))
+    if gUseBlurInTransitions then
+        paint:setImageFilter(Sk.newBlurImageFilter(sigma, sigma))
+    end
     paint:setAlpha(alpha)
 end