Adding an option to render only the shadow in SkDropShadowImageFilter

tests/RecordDrawTest.cpp

Index: tests/RecordDrawTest.cpp
diff --git a/tests/RecordDrawTest.cpp b/tests/RecordDrawTest.cpp
index 0dfd86a8dd19ac8fa3674b1e8af9d641d60a0f6f..43d4f6068b7f4615ffa156c6b192cab4fbd88f2e 100644
--- a/tests/RecordDrawTest.cpp
+++ b/tests/RecordDrawTest.cpp
@@ -234,7 +234,8 @@ DEF_TEST(RecordDraw_SaveLayerAffectsClipBounds, r) {
     // We draw a rectangle with a long drop shadow.  We used to not update the clip
     // bounds based on SaveLayer paints, so the drop shadow could be cut off.
     SkPaint paint;
-    paint.setImageFilter(SkDropShadowImageFilter::Create(20, 0, 0, 0, SK_ColorBLACK))->unref();
+    paint.setImageFilter(SkDropShadowImageFilter::Create(20, 0, 0, 0, SK_ColorBLACK,
+                         SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode))->unref();
 
     recorder.saveLayer(NULL, &paint);
         recorder.clipRect(SkRect::MakeWH(20, 40));