Fix for SkDisplacementMap::onFilterBounds().

src/effects/SkDisplacementMapEffect.cpp

Index: src/effects/SkDisplacementMapEffect.cpp
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 39222444d274b72934027224d29249e654b188f5..d0f134be40ff3d9da7a5fc475894f37388ccd28a 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -257,11 +257,13 @@ void SkDisplacementMapEffect::computeFastBounds(const SkRect& src, SkRect* dst)
 bool SkDisplacementMapEffect::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
                                    SkIRect* dst) const {
     SkIRect bounds = src;
-    if (getColorInput() && !getColorInput()->filterBounds(src, ctm, &bounds)) {
-        return false;
+    SkVector scale = SkVector::Make(fScale, fScale);
+    ctm.mapVectors(&scale, 1);
+    bounds.outset(SkScalarCeilToInt(scale.fX * SK_ScalarHalf),
+                  SkScalarCeilToInt(scale.fY * SK_ScalarHalf));
+    if (getColorInput()) {
+        return getColorInput()->filterBounds(bounds, ctm, dst);
     }
-    bounds.outset(SkScalarCeilToInt(fScale * SK_ScalarHalf),
-                  SkScalarCeilToInt(fScale * SK_ScalarHalf));
     *dst = bounds;
     return true;
 }