Stop tracking whether GrFragmentProcessors read their input

Change-Id: Id5338901978b97289798eaef873527597bd8dfd6
Reviewed-on: https://skia-review.googlesource.com/7414
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/tests/ImageStorageTest.cpp b/tests/ImageStorageTest.cpp
index a55c61b..59d134d 100644
--- a/tests/ImageStorageTest.cpp
+++ b/tests/ImageStorageTest.cpp
@@ -36,7 +36,7 @@
         void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
 
         void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
-            inout->setToUnknown(GrInvariantOutput::kWillNot_ReadInput);
+            inout->setToUnknown();
         }
 
         bool onIsEqual(const GrFragmentProcessor& that) const override { return true; }