Blink side of the change to pass the system font metrics from the browser to the renderer on Windo…

Source/platform/fonts/win/FontCacheSkiaWin.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Computer, Inc.
  * Copyright (c) 2006, 2007, 2008, 2009, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
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 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/FontFaceCreationParams.h"
 #include "platform/fonts/FontPlatformData.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/fonts/win/FontFallbackWin.h"
 
 namespace blink {
 
 HashMap<String, RefPtr<SkTypeface> >* FontCache::s_sideloadedFonts = 0;
 
+// Cached system font metrics.
+AtomicString* FontCache::s_menuFontFamilyName = 0;
+int32_t FontCache::s_menuFontHeight = 0;
+AtomicString* FontCache::s_smallCaptionFontFamilyName = 0;
+int32_t FontCache::s_smallCaptionFontHeight = 0;
+AtomicString* FontCache::s_statusFontFamilyName = 0;
+int32_t FontCache::s_statusFontHeight = 0;
+
+namespace {
+
+int32_t ensureMinimumFontHeightIfNeeded(int32_t fontHeight)
+{
+    // Adjustment for codepage 936 to make the fonts more legible in Simplified Chinese.
+    // Please refer to RenderThemeChromiumFontProviderWin.cpp for more information.
+    return (fontHeight < 12.0f) && (GetACP() == 936) ? 12.0f : fontHeight;
+}
+
+} // namespace
+
 // static
 void FontCache::addSideloadedFontForTesting(SkTypeface* typeface)
 {
     if (!s_sideloadedFonts)
         s_sideloadedFonts = new HashMap<String, RefPtr<SkTypeface> >;
     SkString name;
     typeface->getFamilyName(&name);
     s_sideloadedFonts->set(name.c_str(), adoptRef(typeface));
 }
 
+// static
+void FontCache::setMenuFontMetrics(const wchar_t* familyName, int32_t fontHeight)
+{
+    s_menuFontFamilyName = new AtomicString(familyName);
+    s_menuFontHeight = ensureMinimumFontHeightIfNeeded(fontHeight);
+}
+
+// static
+void FontCache::setSmallCaptionFontMetrics(const wchar_t* familyName, int32_t fontHeight)
+{
+    s_smallCaptionFontFamilyName = new AtomicString(familyName);
+    s_smallCaptionFontHeight = ensureMinimumFontHeightIfNeeded(fontHeight);
+}
+
+// static
+void FontCache::setStatusFontMetrics(const wchar_t* familyName, int32_t fontHeight)
+{
+    s_statusFontFamilyName = new AtomicString(familyName);
+    s_statusFontHeight = ensureMinimumFontHeightIfNeeded(fontHeight);
+}
+
 FontCache::FontCache()
     : m_purgePreventCount(0)
 {
     SkFontMgr* fontManager;
 
     if (s_useDirectWrite) {
         fontManager = SkFontMgr_New_DirectWrite(s_directWriteFactory);
         s_useSubpixelPositioning = true;
     } else {
         fontManager = SkFontMgr_New_GDI();
@@ skipping 313 matching lines @@
         if (typefacesMatchesFamily(tf.get(), family)) {
             result->setMinSizeForSubpixel(minSizeForSubpixelForFont);
             break;
         }
     }
 
     return result;
 }
 
 } // namespace blink