Fix memory leaking on ClosePage.chromium/2862

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

Review-Url: https://codereview.chromium.org/2158023002

1 files changed, 12 insertions, 5 deletions

diff --git a/core/fxge/include/cfx_fontcache.h b/core/fxge/include/cfx_fontcache.h
index d4a4dddaa5..dd9a176d19 100644
--- a/core/fxge/include/cfx_fontcache.h
+++ b/core/fxge/include/cfx_fontcache.h
@@ -8,6 +8,7 @@
 #define CORE_FXGE_INCLUDE_CFX_FONTCACHE_H_
 
 #include <map>
+#include <memory>
 
 #include "core/fxcrt/include/fx_system.h"
 #include "core/fxge/include/fx_font.h"
@@ -19,15 +20,21 @@ class CFX_FontCache {
  public:
   CFX_FontCache();
   ~CFX_FontCache();
-  CFX_FaceCache* GetCachedFace(CFX_Font* pFont);
-  void ReleaseCachedFace(CFX_Font* pFont);
-  void FreeCache(FX_BOOL bRelease = FALSE);
+  CFX_FaceCache* GetCachedFace(const CFX_Font* pFont);
+  void ReleaseCachedFace(const CFX_Font* pFont);
 #ifdef _SKIA_SUPPORT_
-  CFX_TypeFace* GetDeviceCache(CFX_Font* pFont);
+  CFX_TypeFace* GetDeviceCache(const CFX_Font* pFont);
 #endif
 
  private:
-  using CFX_FTCacheMap = std::map<FXFT_Face, CFX_CountedFaceCache*>;
+  struct CountedFaceCache {
+    CountedFaceCache();
+    ~CountedFaceCache();
+    std::unique_ptr<CFX_FaceCache> m_Obj;
+    uint32_t m_nCount;
+  };
+
+  using CFX_FTCacheMap = std::map<FXFT_Face, std::unique_ptr<CountedFaceCache>>;
   CFX_FTCacheMap m_FTFaceMap;
   CFX_FTCacheMap m_ExtFaceMap;
 };