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..76882fef4268a6b576c43dcc0b3aca569d2a8d4d 100644
--- a/include/gpu/GrTextureProvider.h
+++ b/include/gpu/GrTextureProvider.h
@@ -69,6 +69,21 @@ 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();
+    }
+
     /** Legacy function that no longer should be used. */
     enum ScratchTexMatch {
         kExact_ScratchTexMatch,