Revert of Pdfium: Fix fonts leaking on ClosePage. (patchset #10 id:180001 of https://codereview.chromium.org/2158023002/ )

Reason for revert:
Causes heap-use-after-free. See crbug.com/647612.

Original issue's description:
> Fix memory leaking on ClosePage.
> CFX_FontCache refactoring:
>   after this CL: Only one global CFX_FontCache used. Any cached items from it, are released, when its are not used.
>
> BUG=79367,48791
>
> The fonts was not cleared after unloading pages.
>
> Test pdf:
>
> http://www.nasa.gov/pdf/750614main_NASA_FY_2014_Budget_Estimates-508.pdf
>
> For this file, we have ~5 fonts per page, which equal ~1 Mb per page.
> In this PDF we have 670 pages, as result after slow scrolling(reading) full document we have ~600 Mb fonts data in memory.
>
> memory usage of PDF Plugin:
>   before this CL: ~660 Mb
>   after this CL: ~100 Mb
>
> Committed: https://pdfium.googlesource.com/pdfium/+/cde5101eb15b24519e89fa500fe37038bc8e2201

TBR=tsepez@chromium.org,brucedawson@chromium.org,npm@chromium.org,art-snake@yandex-team.ru
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=79367,48791

Review-Url: https://codereview.chromium.org/2350763002

1 files changed, 10 insertions, 25 deletions

diff --git a/core/fxge/include/fx_font.h b/core/fxge/include/fx_font.h
index 58d12bbb2a..fc207a60b2 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_GlyphBitmap;
+class CFX_FontCache;
 class CFX_PathData;
 class CFX_SizeGlyphCache;
 
@@ -115,24 +115,13 @@ class CFX_Font {
                    int* pFaceCount = nullptr);
 
   FX_BOOL LoadClone(const CFX_Font* pFont);
-  void SetFace(FXFT_Face face);
+  void SetFace(FXFT_Face face) { m_Face = face; }
   void SetSubstFont(std::unique_ptr<CFX_SubstFont> subst) {
     m_pSubstFont = std::move(subst);
   }
 #endif  // PDF_ENABLE_XFA
 
-  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
-
+  CFX_PathData* LoadGlyphPath(uint32_t glyph_index, int dest_width = 0);
   int GetGlyphWidth(uint32_t glyph_index);
   int GetAscent() const;
   int GetDescent() const;
@@ -159,7 +148,7 @@ 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) const;
+  void AdjustMMParams(int glyph_index, int width, int weight);
 
   static const size_t kAngleSkewArraySize = 30;
   static const char s_AngleSkew[kAngleSkewArraySize];
@@ -176,20 +165,10 @@ 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;
@@ -219,6 +198,12 @@ 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;