Use macros to define pepper interfaces

ppapi/thunk/ppb_instance_api.h

Index: ppapi/thunk/ppb_instance_api.h
diff --git a/ppapi/thunk/ppb_instance_api.h b/ppapi/thunk/ppb_instance_api.h
index e9caceff362bd79e2bc62f4e0d8b8c50d65a1884..9a5628b3431999fcaf419253a5471723be24afac 100644
--- a/ppapi/thunk/ppb_instance_api.h
+++ b/ppapi/thunk/ppb_instance_api.h
@@ -29,6 +29,15 @@ class PPB_Instance_FunctionAPI {
                                PP_Var script,
                                PP_Var* exception) = 0;
 
+  // Console.
+  virtual void Log(PP_Instance instance,
+                   int log_level,
+                   PP_Var value) = 0;
+  virtual void LogWithSource(PP_Instance instance,
+                             int log_level,
+                             PP_Var source,
+                             PP_Var value) = 0;
+
   // Fullscreen.
   virtual PP_Bool IsFullscreen(PP_Instance instance) = 0;
   virtual PP_Bool SetFullscreen(PP_Instance instance, PP_Bool fullscreen) = 0;