Fix compilation with SK_ENABLE_INST_COUNT=1

src/pdf/SkPDFShader.cpp

Index: src/pdf/SkPDFShader.cpp
diff --git a/src/pdf/SkPDFShader.cpp b/src/pdf/SkPDFShader.cpp
index 60992c3bf6dfe06281827ea08fdde120e5f43418..94bdf2d78d994b637c483ab9da58f8a1235bfbb4 100644
--- a/src/pdf/SkPDFShader.cpp
+++ b/src/pdf/SkPDFShader.cpp
@@ -499,6 +499,7 @@ private:
 };
 
 class SkPDFFunctionShader : public SkPDFDict, public SkPDFShader {
+    SK_DECLARE_INST_COUNT(SkPDFFunctionShader)
 public:
     explicit SkPDFFunctionShader(SkPDFShader::State* state);
     virtual ~SkPDFFunctionShader() {
@@ -524,6 +525,7 @@ private:
     SkAutoTDelete<const SkPDFShader::State> fState;
 
     SkPDFStream* makePSFunction(const SkString& psCode, SkPDFArray* domain);
+    typedef SkPDFDict INHERITED;
 };
 
 /**