tunnel down texture-size-constraint to imagefilters

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index d7af4e65d0656c13572683b08a429c52f13f87ad..c21e03fe1547efcd7778d99a734829a6c4b2b6c8 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -600,6 +600,13 @@ void SkImageFilter::PurgeCache() {
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
+#if SK_SUPPORT_GPU
+SkImageFilter::Proxy::Proxy(bool requireExactTextureSize)
+    : fSizeConstraint(requireExactTextureSize ? GrTextureProvider::kExact_SizeConstraint
+                                              : GrTextureProvider::kApprox_SizeConstraint)
+{}
+#endif
+
 SkBaseDevice* SkImageFilter::DeviceProxy::createDevice(int w, int h) {
     SkBaseDevice::CreateInfo cinfo(SkImageInfo::MakeN32Premul(w, h),
                                    SkBaseDevice::kNever_TileUsage,