Remove willReadDst from GrFragmentProcessor.

src/gpu/gl/builders/GrGLProgramBuilder.cpp

Index: src/gpu/gl/builders/GrGLProgramBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.cpp b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
index 8ec0d2ddbe471955fd686175a31a51a6476ff921..c88efac9f0bc379372defb70aff3558ec8f91e0d 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
@@ -359,14 +359,11 @@ void GrGLProgramBuilder::verify(const GrPrimitiveProcessor& gp) {
 }
 
 void GrGLProgramBuilder::verify(const GrXferProcessor& xp) {
-    // TODO: Once will readDst is only xp enable this assert and remove it from the
-    // FragmentProcessor verify()
-    //SkASSERT(fFS.hasReadDstColor() == xp.willReadDstColor());
+    SkASSERT(fFS.hasReadDstColor() == xp.willReadDstColor());
 }
 
 void GrGLProgramBuilder::verify(const GrFragmentProcessor& fp) {
     SkASSERT(fFS.hasReadFragmentPosition() == fp.willReadFragmentPosition());
-    SkASSERT(fFS.hasReadDstColor() == fp.willReadDstColor());
 }
 
 template <class Proc>