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 e83cb0fe452b038f66caa3692c1ad00276556319..0f417383c2d8b53bb383e8ddd9c8680a27e6d3b9 100644
--- a/fpdfsdk/include/cpdfsdk_baannot.h
+++ b/fpdfsdk/include/cpdfsdk_baannot.h
@@ -37,6 +37,7 @@ 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;
@@ -96,6 +97,8 @@ class CPDFSDK_BAAnnot : public CPDFSDK_Annot {
                        const CFX_ByteString& sContents,
                        const CFX_ByteString& sAPState = "");
 
+  void SetOpenState(bool bState);
+
  protected:
   CPDF_Annot* m_pAnnot;
 };