Replace uses of GR_DEBUG by SK_DEBUG.

BUG=None
R=bsalomon@google.com, robertphillips@google.com

Author: tfarina@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23137022

git-svn-id: http://skia.googlecode.com/svn/trunk@10978 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrTBackendEffectFactory.h b/include/gpu/GrTBackendEffectFactory.h
index 87ace75..1a01e1c 100644
--- a/include/gpu/GrTBackendEffectFactory.h
+++ b/include/gpu/GrTBackendEffectFactory.h
@@ -36,7 +36,7 @@
         EffectKey effectKey = GLEffect::GenKey(drawEffect, caps);
         EffectKey textureKey = GLEffect::GenTextureKey(drawEffect, caps);
         EffectKey attribKey = GLEffect::GenAttribKey(drawEffect);
-#if GR_DEBUG
+#ifdef SK_DEBUG
         static const EffectKey kIllegalIDMask = (uint16_t) (~((1U << kEffectKeyBits) - 1));
         SkASSERT(!(kIllegalIDMask & effectKey));