Make sure SkDrawLooper objects can only be allocated on the heap.

gm/tilemodes_scaled.cpp

Index: gm/tilemodes_scaled.cpp
diff --git a/gm/tilemodes_scaled.cpp b/gm/tilemodes_scaled.cpp
index 932d3f72200c174c60b41e5bb4b668f54dbb9edb..ef3c2b99e0432d2dccee2ff1ab0257676798112e 100644
--- a/gm/tilemodes_scaled.cpp
+++ b/gm/tilemodes_scaled.cpp
@@ -55,10 +55,11 @@ static const SkColorType gColorTypes[] = {
 };
 
 class ScaledTilingGM : public skiagm::GM {
-    SkBlurDrawLooper    fLooper;
+    SkAutoTUnref<SkBlurDrawLooper> fLooper;
 public:
     ScaledTilingGM(bool powerOfTwoSize)
-            : fLooper(SkIntToScalar(1), SkIntToScalar(2), SkIntToScalar(2), 0x88000000)
+            : fLooper(SkBlurDrawLooper::Create(SkIntToScalar(1), SkIntToScalar(2),
+                                               SkIntToScalar(2), 0x88000000))
             , fPowerOfTwoSize(powerOfTwoSize) {
     }
 
@@ -117,7 +118,7 @@ protected:
                 SkString str;
                 p.setAntiAlias(true);
                 p.setDither(true);
-                p.setLooper(&fLooper);
+                p.setLooper(fLooper);
                 str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);
 
                 p.setTextAlign(SkPaint::kCenter_Align);
@@ -157,7 +158,7 @@ protected:
                     SkPaint p;
                     SkString str;
                     p.setAntiAlias(true);
-                    p.setLooper(&fLooper);
+                    p.setLooper(fLooper);
                     str.printf("%s, %s", gColorTypeNames[i], gFilterNames[j]);
                     canvas->drawText(str.c_str(), str.size(), scale*x, scale*(y + r.height() * 2 / 3), p);
                 }