[DirectWrite] Disable subpixel font positioning for old fonts

Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.cpp

Index: Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.cpp
diff --git a/Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.cpp b/Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.cpp
index 471010c7650f8f3f871f8a9ea9ae8c0c0f3debfb..5b99405d2f5ed948a5e6d983b6ba6d2e7bdf00fc 100644
--- a/Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.cpp
+++ b/Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.cpp
@@ -46,6 +46,7 @@ FontPlatformData::FontPlatformData(WTF::HashTableDeletedValueType)
 #if OS(WIN)
     , m_paintTextFlags(0)
     , m_minSizeForAntiAlias(0)
+    , m_minSizeForSubpixel(0)
     , m_useSubpixelPositioning(false)
 #endif
 {
@@ -60,6 +61,7 @@ FontPlatformData::FontPlatformData()
 #if OS(WIN)
     , m_paintTextFlags(0)
     , m_minSizeForAntiAlias(0)
+    , m_minSizeForSubpixel(0)
     , m_useSubpixelPositioning(false)
 #endif
 {
@@ -74,6 +76,7 @@ FontPlatformData::FontPlatformData(float textSize, bool syntheticBold, bool synt
 #if OS(WIN)
     , m_paintTextFlags(0)
     , m_minSizeForAntiAlias(0)
+    , m_minSizeForSubpixel(0)
     , m_useSubpixelPositioning(false)
 #endif
 {
@@ -94,6 +97,7 @@ FontPlatformData::FontPlatformData(const FontPlatformData& src)
 #if OS(WIN)
     , m_paintTextFlags(src.m_paintTextFlags)
     , m_minSizeForAntiAlias(src.m_minSizeForAntiAlias)
+    , m_minSizeForSubpixel(src.m_minSizeForSubpixel)
     , m_useSubpixelPositioning(src.m_useSubpixelPositioning)
 #endif
 {
@@ -112,6 +116,7 @@ FontPlatformData::FontPlatformData(PassRefPtr<SkTypeface> tf, const char* family
 #if OS(WIN)
     , m_paintTextFlags(0)
     , m_minSizeForAntiAlias(0)
+    , m_minSizeForSubpixel(0)
     , m_useSubpixelPositioning(subpixelTextPosition)
 #endif
 {
@@ -132,6 +137,7 @@ FontPlatformData::FontPlatformData(const FontPlatformData& src, float textSize)
 #if OS(WIN)
     , m_paintTextFlags(src.m_paintTextFlags)
     , m_minSizeForAntiAlias(src.m_minSizeForAntiAlias)
+    , m_minSizeForSubpixel(src.m_minSizeForSubpixel)
     , m_useSubpixelPositioning(src.m_useSubpixelPositioning)
 #endif
 {
@@ -157,6 +163,7 @@ FontPlatformData& FontPlatformData::operator=(const FontPlatformData& src)
 #if OS(WIN)
     m_paintTextFlags = 0;
     m_minSizeForAntiAlias = src.m_minSizeForAntiAlias;
+    m_minSizeForSubpixel = src.m_minSizeForSubpixel;
     m_useSubpixelPositioning = src.m_useSubpixelPositioning;
 #endif