Added Inst counting to SkFlattenable-derived classes

http://codereview.appspot.com/6355043/



git-svn-id: http://skia.googlecode.com/svn/trunk@4359 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/core/SkImageFilter.h b/include/core/SkImageFilter.h
index 1b282d2..c27f698 100644
--- a/include/core/SkImageFilter.h
+++ b/include/core/SkImageFilter.h
@@ -38,6 +38,8 @@
  */
 class SK_API SkImageFilter : public SkFlattenable {
 public:
+    SK_DECLARE_INST_COUNT(SkImageFilter)
+
     class Proxy {
     public:
         virtual ~Proxy() {};