Make the Pepper proxy support in-process font rendering.

ppapi/shared_impl/resource_object_base.h

Index: ppapi/shared_impl/resource_object_base.h
===================================================================
--- ppapi/shared_impl/resource_object_base.h	(revision 84713)
+++ ppapi/shared_impl/resource_object_base.h	(working copy)
@@ -8,6 +8,7 @@
 namespace ppapi {
 
 namespace thunk {
+class PPB_Font_API;
 class PPB_Graphics2D_API;
 class PPB_ImageData_API;
 }
@@ -17,6 +18,7 @@
 class ResourceObjectBase {
  public:
 
+  virtual thunk::PPB_Font_API* AsFont_API() { return NULL; }
   virtual thunk::PPB_Graphics2D_API* AsGraphics2D_API() { return NULL; }
   virtual thunk::PPB_ImageData_API* AsImageData_API() { return NULL; }
 
@@ -24,6 +26,10 @@
 };
 
 template<>
+inline thunk::PPB_Font_API* ResourceObjectBase::GetAs() {
+  return AsFont_API();
+}
+template<>
 inline thunk::PPB_Graphics2D_API* ResourceObjectBase::GetAs() {
   return AsGraphics2D_API();
 }