Update mojo sdk to rev 04a510fb37db10642e156957f9b2c11c2f6442ac

mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl

Index: mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
index afdaf1ae801eb4335026cf6dbcaef67c9734c50a..fdbe8ca0df4665ee89ea5b902c127e2873d9e1e8 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
@@ -230,6 +230,9 @@ bool {{class_name}}Stub::Accept(mojo::Message* message) {
 
       params->DecodePointersAndHandles(message->mutable_handles());
       {{alloc_params(method.parameters)|indent(6)}}
+      // A null |sink_| typically means there is a missing call to
+      // InterfacePtr::set_client().
+      assert(sink_);
       sink_->{{method.name}}({{pass_params(method.parameters)}});
       return true;
 {%-     else %}
@@ -259,6 +262,9 @@ bool {{class_name}}Stub::AcceptWithResponder(
               message->request_id(), responder);
       {{interface_macros.declare_callback(method)}} callback(runnable);
       {{alloc_params(method.parameters)|indent(6)}}
+      // A null |sink_| typically means there is a missing call to
+      // InterfacePtr::set_client().
+      assert(sink_);
       sink_->{{method.name}}(
 {%- if method.parameters -%}{{pass_params(method.parameters)}}, {% endif -%}callback);
       return true;
@@ -305,6 +311,9 @@ bool {{class_name}}RequestValidator::Accept(mojo::Message* message) {
   }
 {%- endif %}
 
+  // A null |sink_| typically means there is a missing call to
+  // InterfacePtr::set_client().
+  assert(sink_);
   return sink_->Accept(message);
 }
 
@@ -334,6 +343,9 @@ bool {{class_name}}ResponseValidator::Accept(mojo::Message* message) {
   }
 {%- endif %}
 
+  // A null |sink_| typically means there is a missing call to
+  // InterfacePtr::set_client().
+  assert(sink_);
   return sink_->Accept(message);
 }
 {%- endif -%}