Wrap GrEffects in GrEffectPtr.

This is the first step towards automatic recycling of scratch resouces in the cache via ref-cnts.

R=robertphillips@google.com
Review URL: https://codereview.appspot.com/7092061

git-svn-id: http://skia.googlecode.com/svn/trunk@7222 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkShader.cpp b/src/core/SkShader.cpp
index d895801..d51c2ef 100644
--- a/src/core/SkShader.cpp
+++ b/src/core/SkShader.cpp
@@ -173,7 +173,7 @@
     return kNone_GradientType;
 }
 
-GrEffect* SkShader::asNewEffect(GrContext*, const SkPaint&) const {
+GrEffectRef* SkShader::asNewEffect(GrContext*, const SkPaint&) const {
     return NULL;
 }