PPAPI: Implement PPB_FileMapping on POSIX

ppapi/proxy/interface_list.cc

Index: ppapi/proxy/interface_list.cc
diff --git a/ppapi/proxy/interface_list.cc b/ppapi/proxy/interface_list.cc
index bf4a938f025cead1eb59d46ee776bbf6deac5008..e690a3266607e2e95a62c08541c3970bb7f41173 100644
--- a/ppapi/proxy/interface_list.cc
+++ b/ppapi/proxy/interface_list.cc
@@ -36,6 +36,7 @@
 #include "ppapi/c/ppb_console.h"
 #include "ppapi/c/ppb_core.h"
 #include "ppapi/c/ppb_file_io.h"
+#include "ppapi/c/ppb_file_mapping.h"
 #include "ppapi/c/ppb_file_ref.h"
 #include "ppapi/c/ppb_file_system.h"
 #include "ppapi/c/ppb_fullscreen.h"
@@ -193,12 +194,8 @@ InterfaceList::InterfaceList() {
 #endif  // !defined(OS_NACL)
   }
   {
-    // TODO(teravest): These lines should be uncommented when a dev channel
-    // interface is added.  They're commented right now because they cause an
-    // unused variable warning.
-    //
-    // Permission current_required_permission = PERMISSION_DEV_CHANNEL;
-    // #include "ppapi/thunk/interfaces_ppb_public_dev_channel.h"
+    Permission current_required_permission = PERMISSION_DEV_CHANNEL;
+    #include "ppapi/thunk/interfaces_ppb_public_dev_channel.h"
   }
 
   #undef PROXIED_API