tunnel down texture-size-constraint to imagefilters

src/effects/SkGpuBlurUtils.h

Index: src/effects/SkGpuBlurUtils.h
diff --git a/src/effects/SkGpuBlurUtils.h b/src/effects/SkGpuBlurUtils.h
index 98be8130e28b7d178db781db0d0d896649ddb9cf..357a0d729ca2146cc859a8516f277caeb5b50af9 100644
--- a/src/effects/SkGpuBlurUtils.h
+++ b/src/effects/SkGpuBlurUtils.h
@@ -9,6 +9,8 @@
 #define SkGpuBlurUtils_DEFINED
 
 #if SK_SUPPORT_GPU
+#include "GrTextureProvider.h"
+
 class GrTexture;
 class GrContext;
 #endif
@@ -38,7 +40,8 @@ namespace SkGpuBlurUtils {
                             const SkRect& rect,
                             bool cropToRect,
                             float sigmaX,
-                            float sigmaY);
+                            float sigmaY,
+                            GrTextureProvider::SizeConstraint);
 #endif
 
 };