Make default constructor of Font class to initialize all member variables

third_party/WebKit/Source/platform/fonts/Font.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (c) 2007, 2008, 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 39 matching lines @@
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/CharacterNames.h"
 #include "wtf/text/Unicode.h"
 
 using namespace WTF;
 using namespace Unicode;
 
 namespace blink {
 
 Font::Font()
+    : m_canShapeWordByWord(0)
+    , m_shapeWordByWordComputed(0)
 {
 }
 
 Font::Font(const FontDescription& fd)
     : m_fontDescription(fd)
     , m_canShapeWordByWord(0)
     , m_shapeWordByWordComputed(0)
 {
 }
 
 Font::Font(const Font& other)
     : m_fontDescription(other.m_fontDescription)
     , m_fontFallbackList(other.m_fontFallbackList)
+    // TODO(yosin): We should have a comment the reason why don't we copy
+    // |m_canShapeWordByWord| and |m_shapeWordByWordComputed| from |other|,
+    // since |operator=()| copies them from |other|.
     , m_canShapeWordByWord(0)
     , m_shapeWordByWordComputed(0)
 {
 }
 
 Font& Font::operator=(const Font& other)
 {
     m_fontDescription = other.m_fontDescription;
     m_fontFallbackList = other.m_fontFallbackList;
     m_canShapeWordByWord = other.m_canShapeWordByWord;
@@ skipping 766 matching lines @@
 {
     return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts();
 }
 
 bool Font::isFallbackValid() const
 {
     return !m_fontFallbackList || m_fontFallbackList->isValid();
 }
 
 } // namespace blink