[Extensions Bindings] Add a bridge to use current custom bindings

extensions/renderer/api_binding_hooks.h

Index: extensions/renderer/api_binding_hooks.h
diff --git a/extensions/renderer/api_binding_hooks.h b/extensions/renderer/api_binding_hooks.h
index 249a3390204f3e3614e8ada363ff7d8d6c0685b2..9f40a84dc0e5245b63b89ac9b279ce93c9f0b4c3 100644
--- a/extensions/renderer/api_binding_hooks.h
+++ b/extensions/renderer/api_binding_hooks.h
@@ -62,6 +62,10 @@ class APIBindingHooks {
                      const binding::APISignature* signature,
                      gin::Arguments* arguments);
 
+  // Returns a JS interface that can be used to register hooks.
+  v8::Local<v8::Object> GetJSHookInterface(const std::string& api_name,
+                                           v8::Local<v8::Context> context);
+
  private:
   // Whether we've tried to use any hooks associated with this object.
   bool hooks_used_ = false;