Implement correct clipping for image filters.

gm/imagefiltersscaled.cpp

Index: gm/imagefiltersscaled.cpp
diff --git a/gm/imagefiltersscaled.cpp b/gm/imagefiltersscaled.cpp
index ad52d902e76062292eb9181cac6df3ad7d0f205f..a9c4a10587515c5eaf859df15e903bdc58132b29 100644
--- a/gm/imagefiltersscaled.cpp
+++ b/gm/imagefiltersscaled.cpp
@@ -13,6 +13,7 @@
 #include "SkDropShadowImageFilter.h"
 #include "SkGradientShader.h"
 #include "SkMorphologyImageFilter.h"
+#include "SkOffsetImageFilter.h"
 #include "SkScalar.h"
 
 namespace skiagm {
@@ -96,6 +97,7 @@ protected:
                                         checkerboard.get()),
             new SkDilateImageFilter(1, 1, checkerboard.get()),
             new SkErodeImageFilter(1, 1, checkerboard.get()),
+            new SkOffsetImageFilter(SkIntToScalar(32), 0),
         };
 
         SkVector scales[] = {
@@ -120,7 +122,9 @@ protected:
                 paint.setAntiAlias(true);
                 canvas->save();
                 canvas->scale(scales[j].fX, scales[j].fY);
-                canvas->clipRect(bounds);
+                if (5 == i) {
+                    canvas->translate(SkIntToScalar(-32), 0);
+                }
                 canvas->drawCircle(r.centerX(), r.centerY(),
                                    SkScalarDiv(r.width()*2, SkIntToScalar(5)), paint);
                 canvas->restore();