Use the WebKit default fonts when specifying generic font families.

ppapi/shared_impl/webkit_forwarding.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_SHARED_IMPL_WEBKIT_FORWARDING_H_
 #define PPAPI_SHARED_IMPL_WEBKIT_FORWARDING_H_
 
 #include <string>
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_stdint.h"
 
 struct PP_FontDescription_Dev;
 struct PP_FontMetrics_Dev;
 struct PP_Point;
 struct PP_Rect;
 
 namespace base {
 class WaitableEvent;
 }
 
 namespace skia {
 class PlatformCanvas;
 }
 
 namespace ppapi {
 
+struct Preferences;
+
 class WebKitForwarding {
  public:
   class Font {
    public:
     // C++ version of PP_TextRun_Dev. Since the functions below will be called
     // on an alternate thread in the proxy, and since there are different
     // methods of converting PP_Var -> strings in the plugin and the proxy, we
     // can't use PP_Vars in the Do* functions below.
     struct TextRun {
       std::string text;
@@ skipping 48 matching lines @@
 
   virtual ~WebKitForwarding();
 
   // Creates a new font with the given description. The desc_face is the face
   // name already extracted from the description. The caller owns the result
   // pointer, which will never be NULL. If non-null, the given event will be
   // set on completion.
   virtual void CreateFontForwarding(base::WaitableEvent* event,
                                     const PP_FontDescription_Dev& desc,
                                     const std::string& desc_face,
+                                    const Preferences& prefs,
                                     Font** result) = 0;
-
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_WEBKIT_FORWARDING_H_