Initialize FDE_TEXTEDITPIECE.

BUG=pdfium:958

Change-Id: I7c17c327db974dacbeb3577d79c9522de348c78e
Reviewed-on: https://pdfium-review.googlesource.com/20730
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/xfa/fde/cfde_texteditengine.h b/xfa/fde/cfde_texteditengine.h
index 43cfe0c..5decc18 100644
--- a/xfa/fde/cfde_texteditengine.h
+++ b/xfa/fde/cfde_texteditengine.h
@@ -23,11 +23,11 @@
   FDE_TEXTEDITPIECE(const FDE_TEXTEDITPIECE& that);
   ~FDE_TEXTEDITPIECE();
 
-  int32_t nStart;
-  int32_t nCount;
-  int32_t nBidiLevel;
+  int32_t nStart = 0;
+  int32_t nCount = 0;
+  int32_t nBidiLevel = 0;
   CFX_RectF rtPiece;
-  uint32_t dwCharStyles;
+  uint32_t dwCharStyles = 0;
 };
 
 inline FDE_TEXTEDITPIECE::FDE_TEXTEDITPIECE() = default;