Implement direct write fallback proxy

content/child/dwrite_font_proxy/dwrite_font_proxy_win.cc

Index: content/child/dwrite_font_proxy/dwrite_font_proxy_win.cc
diff --git a/content/child/dwrite_font_proxy/dwrite_font_proxy_win.cc b/content/child/dwrite_font_proxy/dwrite_font_proxy_win.cc
index d99296ee126519db35e0e0e2f3fe9d41b003176b..b1ba345551075b9deb0fd4d9be15ec6c3c07ea42 100644
--- a/content/child/dwrite_font_proxy/dwrite_font_proxy_win.cc
+++ b/content/child/dwrite_font_proxy/dwrite_font_proxy_win.cc
@@ -241,6 +241,20 @@ bool DWriteFontCollectionProxy::LoadFamily(
   return SUCCEEDED(hr);
 }
 
+bool DWriteFontCollectionProxy::GetFontFamily(UINT32 family_index,
+                                              const base::string16& family_name,
+                                              IDWriteFontFamily** font_family) {
+  if (!CreateFamily(family_index))

[ananta, 2016/04/12 23:44:39]

Please check for valid parameters here, especially the out ones. 

[Ilya Kulshin, 2016/04/13 01:33:28]

Added a dcheck that font_family is not null and family_name is not empty.
CreateFamily validates family_index.

+    return false;
+
+  mswr::ComPtr<DWriteFontFamilyProxy>& family = families_[family_index];
+  if (!family->IsLoaded() || family->GetName().empty())
+    family->SetName(family_name);
+
+  family.CopyTo(font_family);
+  return true;
+}
+
 bool DWriteFontCollectionProxy::LoadFamilyNames(
     UINT32 family_index,
     IDWriteLocalizedStrings** localized_strings) {