tunnel down texture-size-constraint to imagefilters

include/gpu/GrTextureProvider.h

Index: include/gpu/GrTextureProvider.h
diff --git a/include/gpu/GrTextureProvider.h b/include/gpu/GrTextureProvider.h
index 44c8cbc6578424aaed6a0e3422d9e4915597ee6e..5635583d80fef393a746ae75f32edc0d2a3c8025 100644
--- a/include/gpu/GrTextureProvider.h
+++ b/include/gpu/GrTextureProvider.h
@@ -9,6 +9,7 @@
 #define GrTextureProvider_DEFINED
 
 #include "GrTexture.h"
+#include "SkImageFilter.h"
 
 class SK_API GrTextureProvider {
 public:
@@ -69,6 +70,31 @@ public:
      */
     GrTexture* createApproxTexture(const GrSurfaceDesc&);
 
+    enum SizeConstraint {
+        kExact_SizeConstraint,
+        kApprox_SizeConstraint,
+    };
+
+    GrTexture* createTexture(const GrSurfaceDesc& desc, SizeConstraint constraint) {
+        switch (constraint) {
+            case kExact_SizeConstraint:
+                return this->createTexture(desc, true);
+            case kApprox_SizeConstraint:
+                return this->createApproxTexture(desc);
+        }
+        sk_throw();
+        return nullptr;
+    }
+
+    static SizeConstraint FromImageFilter(SkImageFilter::SizeConstraint constraint) {
+        if (SkImageFilter::kExact_SizeConstraint == constraint) {
+            return kExact_SizeConstraint;
+        } else {
+            SkASSERT(SkImageFilter::kApprox_SizeConstraint == constraint);
+            return kApprox_SizeConstraint;
+        }
+    }
+
     /** Legacy function that no longer should be used. */
     enum ScratchTexMatch {
         kExact_ScratchTexMatch,