Pdfium: Fix fonts leaking on ClosePage.

core/fxge/include/fx_font.h

Index: core/fxge/include/fx_font.h
diff --git a/core/fxge/include/fx_font.h b/core/fxge/include/fx_font.h
index 9a976c44b77bd10ebde7156fdee4f77a107e3cc1..00c9d6f55970cd233461e0a08068a54fe964e7b8 100644
--- a/core/fxge/include/fx_font.h
+++ b/core/fxge/include/fx_font.h
@@ -19,7 +19,7 @@ typedef struct FT_FaceRec_* FXFT_Face;
 typedef void* FXFT_Library;
 
 class CFX_FaceCache;
-class CFX_FontCache;
+class CFX_GlyphBitmap;
 class CFX_PathData;
 class CFX_SizeGlyphCache;
 
@@ -106,13 +106,24 @@ class CFX_Font {
                    int* pFaceCount = nullptr);
 
   FX_BOOL LoadClone(const CFX_Font* pFont);
-  void SetFace(FXFT_Face face) { m_Face = face; }
+  void SetFace(FXFT_Face face);
   void SetSubstFont(std::unique_ptr<CFX_SubstFont> subst) {
     m_pSubstFont = std::move(subst);
   }
 #endif  // PDF_ENABLE_XFA
 
-  CFX_PathData* LoadGlyphPath(uint32_t glyph_index, int dest_width = 0);
+  const CFX_GlyphBitmap* LoadGlyphBitmap(uint32_t glyph_index,
+                                         FX_BOOL bFontStyle,
+                                         const CFX_Matrix* pMatrix,
+                                         int dest_width,
+                                         int anti_alias,
+                                         int& text_flags) const;
+  const CFX_PathData* LoadGlyphPath(uint32_t glyph_index, int dest_width) const;
+
+#ifdef _SKIA_SUPPORT_
+  CFX_TypeFace* GetDeviceCache() const;
+#endif
+
   int GetGlyphWidth(uint32_t glyph_index);
   int GetAscent() const;
   int GetDescent() const;
@@ -139,7 +150,7 @@ class CFX_Font {
 #endif
   uint8_t* GetFontData() const { return m_pFontData; }
   uint32_t GetSize() const { return m_dwSize; }
-  void AdjustMMParams(int glyph_index, int width, int weight);
+  void AdjustMMParams(int glyph_index, int width, int weight) const;
 
   static const size_t kAngleSkewArraySize = 30;
   static const char s_AngleSkew[kAngleSkewArraySize];
@@ -156,10 +167,20 @@ class CFX_Font {
 #endif  // PDF_ENABLE_XFA
 
  private:
+  friend class CFX_FaceCache;
+  CFX_PathData* LoadGlyphPathImpl(uint32_t glyph_index,
+                                  int dest_width = 0) const;
+
+ private:
+  CFX_FaceCache* GetFaceCache() const;
+
   void ReleasePlatformResource();
   void DeleteFace();
 
+  void ClearFaceCache();
+
   FXFT_Face m_Face;
+  mutable CFX_FaceCache* m_FaceCache;  // not owned.
   std::unique_ptr<CFX_SubstFont> m_pSubstFont;
   std::vector<uint8_t> m_pFontDataAllocation;
   uint8_t* m_pFontData;
@@ -189,12 +210,6 @@ class CFX_FontFaceInfo {
   uint32_t m_Charsets;
 };
 
-class CFX_CountedFaceCache {
- public:
-  CFX_FaceCache* m_Obj;
-  uint32_t m_nCount;
-};
-
 class CFX_GlyphBitmap {
  public:
   int m_Top;