plumb SkInstCnt to all subclasses of GrRefCnt



git-svn-id: http://skia.googlecode.com/svn/trunk@4353 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrDrawTarget.h b/src/gpu/GrDrawTarget.h
index f619469..d42a1f9 100644
--- a/src/gpu/GrDrawTarget.h
+++ b/src/gpu/GrDrawTarget.h
@@ -27,6 +27,8 @@
 
 class GrDrawTarget : public GrRefCnt {
 public:
+    SK_DECLARE_INST_COUNT(GrDrawTarget)
+
     /**
      * Represents the draw target capabilities.
      */
@@ -1065,7 +1067,8 @@
     };
     SkSTArray<kPreallocGeoSrcStateStackCnt, 
               GeometrySrcState, true>           fGeoSrcStateStack;
-    
+
+    typedef GrRefCnt INHERITED;
 };
 
 GR_MAKE_BITFIELD_OPS(GrDrawTarget::BlendOptFlags);