Display content of the annotation when mouse hover.

fpdfsdk/include/cpdfsdk_baannot.h

Index: fpdfsdk/include/cpdfsdk_baannot.h
diff --git a/fpdfsdk/include/cpdfsdk_baannot.h b/fpdfsdk/include/cpdfsdk_baannot.h
index abe23fe1b9c9ce0d09491289179c9a0334497712..d17b951c0858ea2327d8e40ef1ab91f9ffe2a3f6 100644
--- a/fpdfsdk/include/cpdfsdk_baannot.h
+++ b/fpdfsdk/include/cpdfsdk_baannot.h
@@ -38,6 +38,7 @@ class CPDFSDK_BAAnnot : public CPDFSDK_Annot {
                     CPDF_RenderOptions* pOptions) override;
 
   CPDF_Dictionary* GetAnnotDict() const;
+  CPDF_Annot* GetPDFPopupAnnot() const;
 
   void SetContents(const CFX_WideString& sContents);
   CFX_WideString GetContents() const;
@@ -97,6 +98,8 @@ class CPDFSDK_BAAnnot : public CPDFSDK_Annot {
                        const CFX_ByteString& sContents,
                        const CFX_ByteString& sAPState = "");
 
+  void SetOpenState(bool bState);
+
  protected:
   CPDF_Annot* m_pAnnot;
 };