[oilpan] Move CSSSegmentedFontFace to the managed heap

Source/core/css/CSSFontSelector.cpp

Index: Source/core/css/CSSFontSelector.cpp
diff --git a/Source/core/css/CSSFontSelector.cpp b/Source/core/css/CSSFontSelector.cpp
index 8828f1d8863ead16c88051f5398f29cf4830c88e..192577b8f2357efe8821a2c6d3f36eb4d1e0a55e 100644
--- a/Source/core/css/CSSFontSelector.cpp
+++ b/Source/core/css/CSSFontSelector.cpp
@@ -78,6 +78,16 @@ CSSFontSelector::~CSSFontSelector()
 {
     clearDocument();
     fontCache()->removeClient(this);
+
+    // FIXME(oilpan): This code iterates over all CSSSegmentedFontFace's CSSFontSelector owns
+    // and ask their CSSFontFace's to clear their lists of CSSFontFaceSource.
+    // When CSSFontSelector is moved to the managed heap we should move this
+    // clearing to the moment when StyleResolver is detached from the document (by clearStyleResolver()).
+    for (HashMap<String, OwnPtr<SegmentedFontFaceHashMap>, WTF::FastAllocator, CaseFoldingHash>::iterator it = m_fonts.begin(); it != m_fonts.end(); ++it) {
+        SegmentedFontFaceHashMap* segmentedFontFaceHashMap = it->value.get();
+        for (SegmentedFontFaceHashMap::iterator it2 = segmentedFontFaceHashMap->begin(); it2 != segmentedFontFaceHashMap->end(); ++it2)
+            it2->value->dispose();
+    }
 }
 
 bool CSSFontSelector::isEmpty() const
@@ -487,7 +497,7 @@ PassRefPtr<FontData> CSSFontSelector::getFontData(const FontDescription& fontDes
         return 0;
     }
 
-    CSSSegmentedFontFace* face = getFontFace(fontDescription, familyName);
+    Handle<CSSSegmentedFontFace> face = getFontFace(fontDescription, familyName);
     // If no face was found, then return 0 and let the OS come up with its best match for the name.
     if (!face) {
         // If we were handed a generic family, but there was no match, go ahead and return the correct font based off our
@@ -501,21 +511,22 @@ PassRefPtr<FontData> CSSFontSelector::getFontData(const FontDescription& fontDes
     return face->getFontData(fontDescription);
 }
 
-CSSSegmentedFontFace* CSSFontSelector::getFontFace(const FontDescription& fontDescription, const AtomicString& family)
+Result<CSSSegmentedFontFace> CSSFontSelector::getFontFace(const FontDescription& fontDescription, const AtomicString& family)
 {
     Vector<RefPtr<CSSFontFace> >* familyFontFaces = m_fontFaces.get(family);
     if (!familyFontFaces || familyFontFaces->isEmpty())
-        return 0;
+        return nullptr;
 
-    OwnPtr<HashMap<unsigned, RefPtr<CSSSegmentedFontFace> > >& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
+    OwnPtr<HashMap<unsigned, Persistent<CSSSegmentedFontFace> > >& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
     if (!segmentedFontFaceCache)
-        segmentedFontFaceCache = adoptPtr(new HashMap<unsigned, RefPtr<CSSSegmentedFontFace> >);
+        segmentedFontFaceCache = adoptPtr(new HashMap<unsigned, Persistent<CSSSegmentedFontFace> >());
 
     FontTraitsMask traitsMask = fontDescription.traitsMask();
 
-    RefPtr<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, 0).iterator->value;
+    Handle<CSSSegmentedFontFace> face = segmentedFontFaceCache->add(traitsMask, nullptr).iterator->value;
     if (!face) {
         face = CSSSegmentedFontFace::create(this);
+        segmentedFontFaceCache->set(traitsMask, face);
 
         // Collect all matching faces and sort them in order of preference.
         Vector<CSSFontFace*, 32> candidateFontFaces;
@@ -554,7 +565,7 @@ CSSSegmentedFontFace* CSSFontSelector::getFontFace(const FontDescription& fontDe
         for (unsigned i = 0; i < numCandidates; ++i)
             face->appendFontFace(candidateFontFaces[i]);
     }
-    return face.get();
+    return face;
 }
 
 void CSSFontSelector::clearDocument()