Merge to XFA: Fix some -Wmaybe-uninitialized errors.

core/src/fpdfapi/fpdf_edit/fpdf_edit_image.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 "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../include/fxcodec/fx_codec.h"
 #include "../../../include/fpdfapi/fpdf_render.h"
@@ skipping 200 matching lines @@
   if (!pMaskBitmap && pMask) {
     FXDIB_Format maskFormat = pMask->GetFormat();
     if (maskFormat == FXDIB_1bppMask || maskFormat == FXDIB_8bppMask) {
       pMaskBitmap = pMask;
     }
   }
   if (pMaskBitmap) {
     int32_t maskWidth = pMaskBitmap->GetWidth();
     int32_t maskHeight = pMaskBitmap->GetHeight();
     uint8_t* mask_buf = NULL;
-    FX_STRSIZE mask_size;
+    FX_STRSIZE mask_size = 0;
     CPDF_Dictionary* pMaskDict = new CPDF_Dictionary;
     pMaskDict->SetAtName(FX_BSTRC("Type"), FX_BSTRC("XObject"));
     pMaskDict->SetAtName(FX_BSTRC("Subtype"), FX_BSTRC("Image"));
     pMaskDict->SetAtInteger(FX_BSTRC("Width"), maskWidth);
     pMaskDict->SetAtInteger(FX_BSTRC("Height"), maskHeight);
     pMaskDict->SetAtName(FX_BSTRC("ColorSpace"), FX_BSTRC("DeviceGray"));
     pMaskDict->SetAtInteger(FX_BSTRC("BitsPerComponent"), 8);
     if (pMaskBitmap->GetBPP() == 8 &&
         (iCompress & PDF_IMAGE_MASK_LOSSY_COMPRESS) != 0) {
       _DCTEncodeBitmap(pMaskDict, pMaskBitmap, pParam ? pParam->nQuality : 75,
@@ skipping 144 matching lines @@
     m_pStream->InitStream(pFileRead, pDict);
   }
   m_bIsMask = pBitmap->IsAlphaMask();
   m_Width = BitmapWidth;
   m_Height = BitmapHeight;
   FX_Free(dest_buf);
 }
 void CPDF_Image::ResetCache(CPDF_Page* pPage, const CFX_DIBitmap* pBitmap) {
   pPage->GetRenderCache()->ResetBitmap(m_pStream, pBitmap);
 }