Add frame-specific InterfaceProviderSpec.

content/public/common/service_manager_connection.h

Index: content/public/common/service_manager_connection.h
diff --git a/content/public/common/service_manager_connection.h b/content/public/common/service_manager_connection.h
index 23b8f1a6c3f4b241cd734c7ba236e75b03de0d33..4386b768598c9ff62b71198d948a2c898464ef58 100644
--- a/content/public/common/service_manager_connection.h
+++ b/content/public/common/service_manager_connection.h
@@ -39,6 +39,9 @@ class CONTENT_EXPORT ServiceManagerConnection {
  public:
   using ServiceRequestHandler =
       base::Callback<void(service_manager::mojom::ServiceRequest)>;
+  using OnConnectHandler =
+      base::Callback<void(const service_manager::ServiceInfo&,
+                          const service_manager::ServiceInfo&)>;
   using Factory =
       base::Callback<std::unique_ptr<ServiceManagerConnection>(void)>;
 
@@ -144,6 +147,12 @@ class CONTENT_EXPORT ServiceManagerConnection {
   virtual void AddServiceRequestHandler(
       const std::string& name,
       const ServiceRequestHandler& handler) = 0;
+
+  // Registers a callback to be run when the service_manager::Service
+  // implementation on the IO thread receives OnConnect(). Returns an id that
+  // can be passed to RemoveOnConnectHandler(), starting at 1.
+  virtual int AddOnConnectHandler(const OnConnectHandler& handler) = 0;
+  virtual void RemoveOnConnectHandler(int id) = 0;
 };
 
 }  // namespace content