tunnel down texture-size-constraint to imagefilters

include/core/SkImageFilter.h

Index: include/core/SkImageFilter.h
diff --git a/include/core/SkImageFilter.h b/include/core/SkImageFilter.h
index 64e1581373d0c6eeb0a3b9e2ed1e4ee4d0d991ea..647e1add24f137a7601fa9d7a5e1acc1e8def162 100644
--- a/include/core/SkImageFilter.h
+++ b/include/core/SkImageFilter.h
@@ -15,6 +15,10 @@
 #include "SkRect.h"
 #include "SkSurfaceProps.h"
 
+#if SK_SUPPORT_GPU
+#include "GrTextureProvider.h"
+#endif
+
 class GrFragmentProcessor;
 class GrTexture;
 class SkBaseDevice;
@@ -95,6 +99,7 @@ public:
 
     class Proxy {
     public:
+        Proxy(bool needExactTextureSize = false);
         virtual ~Proxy() {}
 
         virtual SkBaseDevice* createDevice(int width, int height) = 0;
@@ -104,6 +109,17 @@ public:
         virtual bool filterImage(const SkImageFilter*, const SkBitmap& src,
                                  const SkImageFilter::Context&,
                                  SkBitmap* result, SkIPoint* offset) = 0;
+
+#if SK_SUPPORT_GPU
+        GrTextureProvider::SizeConstraint getSizeConstraint() const {
+            return fSizeConstraint;
+        }
+#endif
+
+    private:
+#if SK_SUPPORT_GPU
+        const GrTextureProvider::SizeConstraint fSizeConstraint;
+#endif
     };
 
     class DeviceProxy : public Proxy {