SkRectShaderImageFilter: add a workaround for the zero-sized rects currently passed by Blink. Add …

src/effects/SkRectShaderImageFilter.cpp

Index: src/effects/SkRectShaderImageFilter.cpp
diff --git a/src/effects/SkRectShaderImageFilter.cpp b/src/effects/SkRectShaderImageFilter.cpp
index b1faebc813646c0a67eb4dca01f940d58445264b..37d6af28adccb2201fb719aa56d5a4f7c47f4fd3 100644
--- a/src/effects/SkRectShaderImageFilter.cpp
+++ b/src/effects/SkRectShaderImageFilter.cpp
@@ -16,9 +16,17 @@ SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const SkRe
     SkASSERT(s);
 #ifdef SK_CROP_RECT_IS_INT
     SkIRect cropRect;
-    rect.roundOut(&cropRect);
+    if (rect.width() == 0 || rect.height() == 0) {
+        cropRect = SkIRect::MakeLargest();
+    } else {
+        rect.roundOut(&cropRect);
+    }
 #else
-    CropRect cropRect(rect);
+    uint32_t flags = CropRect::kHasAll_CropEdge;
+    if (rect.width() == 0 || rect.height() == 0) {
+        flags = 0x0;
+    }
+    CropRect cropRect(rect, flags);
 #endif
     return SkNEW_ARGS(SkRectShaderImageFilter, (s, &cropRect));
 }