add option to supress prints on context

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index a1489c6a4211f6b7df13d8b736f9468e03c078d1..549ab374c8f71940f77b5a003a69b575b14c4972 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -68,7 +68,8 @@ bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuil
         drawBounds->roundOut(&drawIBounds);
         if (!copyRect.intersect(drawIBounds)) {
 #ifdef SK_DEBUG
-            SkDebugf("Missed an early reject. Bailing on draw from setupDstReadIfNecessary.\n");
+            GrContextDebugf(fContext, "Missed an early reject. "
+                                      "Bailing on draw from setupDstReadIfNecessary.\n");
 #endif
             return false;
         }