Add CFX_FontMapper::IsBuiltinFace() in master branch

core/src/fxge/ge/fx_ge_fontmap.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <limits>
 
 #include "core/include/fxge/fx_freetype.h"
 #include "core/include/fxge/fx_ge.h"
@@ skipping 1196 matching lines @@
     if (italic_angle == 0) {
       italic_angle = -12;
     } else if (FXSYS_abs(italic_angle) < 5) {
       italic_angle = 0;
     }
     pSubstFont->m_ItalicAngle = italic_angle;
   }
   m_pFontInfo->DeleteFont(hFont);
   return face;
 }
+FX_BOOL CFX_FontMapper::IsBuiltinFace(const FXFT_Face face) const {
+  for (int i = 0; i < MM_FACE_COUNT; ++i) {
+    if (m_MMFaces[i] == face)
+      return TRUE;
+  }
+  for (int i = 0; i < FOXIT_FACE_COUNT; ++i) {
+    if (m_FoxitFaces[i] == face)
+      return TRUE;
+  }
+  return FALSE;
+}
 extern "C" {
 unsigned long _FTStreamRead(FXFT_Stream stream,
                             unsigned long offset,
                             unsigned char* buffer,
                             unsigned long count);
 void _FTStreamClose(FXFT_Stream stream);
 };
 #if _FX_OS_ == _FX_ANDROID_
 IFX_SystemFontInfo* IFX_SystemFontInfo::CreateDefault(const char** pUnused) {
   return NULL;
@@ skipping 270 matching lines @@
 int PDF_GetStandardFontName(CFX_ByteString* name) {
   AltFontName* found = static_cast<AltFontName*>(
       FXSYS_bsearch(name->c_str(), g_AltFontNames, FX_ArraySize(g_AltFontNames),
                     sizeof(AltFontName), CompareString));
   if (!found)
     return -1;
 
   *name = g_Base14FontNames[found->m_Index];
   return found->m_Index;
 }