Support getting the font list in Pepper. This currently only works out of

ppapi/shared_impl/function_group_base.h

Index: ppapi/shared_impl/function_group_base.h
===================================================================
--- ppapi/shared_impl/function_group_base.h	(revision 85766)
+++ ppapi/shared_impl/function_group_base.h	(working copy)
@@ -8,6 +8,7 @@
 namespace ppapi {
 
 namespace thunk {
+class PPB_Font_FunctionAPI;
 class ResourceCreationAPI;
 }
 
@@ -15,12 +16,17 @@
  public:
   // Dynamic casting for this object. Returns the pointer to the given type if
   // it's supported.
+  virtual thunk::PPB_Font_FunctionAPI* AsFont_FunctionAPI() { return NULL; }
   virtual thunk::ResourceCreationAPI* AsResourceCreation() { return NULL; }
 
   template <typename T> T* GetAs() { return NULL; }
 };
 
 template<>
+inline thunk::PPB_Font_FunctionAPI* FunctionGroupBase::GetAs() {
+  return AsFont_FunctionAPI();
+}
+template<>
 inline ppapi::thunk::ResourceCreationAPI* FunctionGroupBase::GetAs() {
   return AsResourceCreation();
 }