Hamfisted "fix" for pinterest blur crash

https://codereview.chromium.org/23819014/



git-svn-id: http://skia.googlecode.com/svn/trunk@11057 2bbb7eff-a529-9590-31e7-b0007b416f81

src/effects/SkBlurMaskFilter.cpp

@@ -292,7 +292,9 @@ SkBlurMaskFilterImpl::filterRectsToNine(const SkRect rects[], int count,
     }
 
     smallR[0].set(rects[0].left(), rects[0].top(), rects[0].right() - dx, rects[0].bottom() - dy);
-    SkASSERT(!smallR[0].isEmpty());
+    if (smallR[0].width() < 2 || smallR[0].height() < 2) {
+        return kUnimplemented_FilterReturn;
+    }
     if (2 == count) {
         smallR[1].set(rects[1].left(), rects[1].top(),
                       rects[1].right() - dx, rects[1].bottom() - dy);