Don't turn on dither for saveLayers which have no paint

Only the gpu, 565 and msaa configs of GMs in ignored-tests.txt need rebaselining.

NOTRY=true

Review URL: https://codereview.chromium.org/619363002
diff --git a/expectations/gm/ignored-tests.txt b/expectations/gm/ignored-tests.txt
index bf5f620..2169af0 100644
--- a/expectations/gm/ignored-tests.txt
+++ b/expectations/gm/ignored-tests.txt
@@ -38,3 +38,31 @@
 
 # rileya - https://codereview.chromium.org/516463005/ will rebaseline after bots cycle
 yuv_to_rgb_effect
+
+# robertphillips - Don't turn on dither for saveLayers which have no paint https://codereview.chromium.org/619363002/
+aarectmodes
+arithmode
+complexclip_aa_layer
+complexclip_bw_layer
+convex_poly_clip
+hairmodes
+lerpmode
+lumafilter
+modecolorfilters
+multipicturedraw_invpathclip_simple
+multipicturedraw_invpathclip_tiled
+multipicturedraw_noclip_simple
+multipicturedraw_noclip_tiled
+multipicturedraw_pathclip_simple
+multipicturedraw_pathclip_tiled
+multipicturedraw_rectclip_simple
+multipicturedraw_rectclip_tiled
+multipicturedraw_rrectclip_simple
+multipicturedraw_rrectclip_tiled
+multipicturedraw_sierpinski_simple
+multipicturedraw_sierpinski_tiled
+xfermodes
+xfermodes2
+xfermodes3
+
+
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 065aecd..c57add4 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1204,7 +1204,6 @@
                                   const SkPaint* paint) {
     SkPaint tmp;
     if (NULL == paint) {
-        tmp.setDither(true);
         paint = &tmp;
     }