Use unicode-range to prevent unnecessary @font-face donwnloads

Source/core/css/CSSFontFace.cpp

Index: Source/core/css/CSSFontFace.cpp
diff --git a/Source/core/css/CSSFontFace.cpp b/Source/core/css/CSSFontFace.cpp
index efb19e250a8e7bf92bcb5c59b60ee81aa0516d2a..4854ed1c5d2d84673e780461feb6a7673d4c694c 100644
--- a/Source/core/css/CSSFontFace.cpp
+++ b/Source/core/css/CSSFontFace.cpp
@@ -67,6 +67,18 @@ void CSSFontFace::setSegmentedFontFace(CSSSegmentedFontFace* segmentedFontFace)
     m_segmentedFontFace = segmentedFontFace;
 }
 
+void CSSFontFace::beginLoadingFontSoon(FontResource* resource)
+{
+    if (!m_segmentedFontFace)
+        return;
+
+    CSSFontSelector* fontSelector = m_segmentedFontFace->fontSelector();
+    fontSelector->beginLoadingFontSoon(resource);
+
+    if (m_loadState == NotLoaded)
+        setLoadState(Loading);
+}
+
 void CSSFontFace::fontLoaded(CSSFontFaceSource* source)
 {
     if (source != m_activeSource)
@@ -100,19 +112,20 @@ PassRefPtr<SimpleFontData> CSSFontFace::getFontData(const FontDescription& fontD
     ASSERT(m_segmentedFontFace);
     CSSFontSelector* fontSelector = m_segmentedFontFace->fontSelector();
 
-    if (m_loadState == NotLoaded)
-        setLoadState(Loading);
-
     size_t size = m_sources.size();
     for (size_t i = 0; i < size; ++i) {
         if (RefPtr<SimpleFontData> result = m_sources[i]->getFontData(fontDescription, syntheticBold, syntheticItalic, fontSelector)) {
             m_activeSource = m_sources[i].get();
+            if (m_loadState == NotLoaded && (m_sources[i]->isLoading() || m_sources[i]->isLoaded()))
+                setLoadState(Loading);
             if (m_loadState == Loading && m_sources[i]->isLoaded())
                 setLoadState(Loaded);
             return result.release();
         }
     }
 
+    if (m_loadState == NotLoaded)
+        setLoadState(Loading);
     if (m_loadState == Loading)
         setLoadState(Error);
     return 0;