[Extensions Binding] Allow for registering custom hooks

extensions/renderer/api_binding.h

Index: extensions/renderer/api_binding.h
diff --git a/extensions/renderer/api_binding.h b/extensions/renderer/api_binding.h
index af680534a7ecd3d318422768d5450c9eef021b33..464ec86efb15e1f860f0df7287cb376c5c839630 100644
--- a/extensions/renderer/api_binding.h
+++ b/extensions/renderer/api_binding.h
@@ -25,6 +25,7 @@ class Arguments;
 }
 
 namespace extensions {
+class APIBindingHooks;
 class APIEventHandler;
 
 // A class that vends v8::Objects for extension APIs. These APIs have function
@@ -62,6 +63,7 @@ class APIBinding {
              const base::ListValue* type_definitions,
              const base::ListValue* event_definitions,
              const APIMethodCallback& callback,
+             std::unique_ptr<APIBindingHooks> binding_hooks,
              ArgumentSpec::RefMap* type_refs);
   ~APIBinding();
 
@@ -93,6 +95,10 @@ class APIBinding {
   // The callback to use when an API is invoked with valid arguments.
   APIMethodCallback method_callback_;
 
+  // The registered hooks for this API. Null if there are no registered custom
+  // hooks.
+  std::unique_ptr<APIBindingHooks> binding_hooks_;
+
   // The reference map for all known types; required to outlive this object.
   const ArgumentSpec::RefMap* type_refs_;