Move willUseInputColor check to computeInvariantOutput

include/gpu/GrPaint.h

Index: include/gpu/GrPaint.h
diff --git a/include/gpu/GrPaint.h b/include/gpu/GrPaint.h
index ff37fcfee899d9f4728d94006208b02f508ed12a..c5563f00fa28ee1fcfb1cd3150eaa5f5b5cdc9da 100644
--- a/include/gpu/GrPaint.h
+++ b/include/gpu/GrPaint.h
@@ -89,9 +89,6 @@ public:
      */
     const GrFragmentProcessor* addColorProcessor(const GrFragmentProcessor* fp) {
         SkASSERT(fp);
-        if (!fp->willUseInputColor()) {
-            fColorStages.reset();
-        }
         SkNEW_APPEND_TO_TARRAY(&fColorStages, GrFragmentStage, (fp));
         return fp;
     }
@@ -101,9 +98,6 @@ public:
      */
     const GrFragmentProcessor* addCoverageProcessor(const GrFragmentProcessor* fp) {
         SkASSERT(fp);
-        if (!fp->willUseInputColor()) {
-            fCoverageStages.reset();
-        }
         SkNEW_APPEND_TO_TARRAY(&fCoverageStages, GrFragmentStage, (fp));
         return fp;
     }