DevTools: Add parent id to target descriptor in remote debugging.

content/browser/devtools/devtools_http_handler_impl.cc

Index: content/browser/devtools/devtools_http_handler_impl.cc
diff --git a/content/browser/devtools/devtools_http_handler_impl.cc b/content/browser/devtools/devtools_http_handler_impl.cc
index 8678848564d2be587c1467ce22bd21e4201c2a0f..5a5bb09fa675d8b60e1b3a22722e50dd9b95be2a 100644
--- a/content/browser/devtools/devtools_http_handler_impl.cc
+++ b/content/browser/devtools/devtools_http_handler_impl.cc
@@ -54,6 +54,7 @@ const char kThumbUrlPrefix[] = "/thumb/";
 const char kPageUrlPrefix[] = "/devtools/page/";
 
 const char kTargetIdField[] = "id";
+const char kTargetParentIdField[] = "parentId";
 const char kTargetTypeField[] = "type";
 const char kTargetTitleField[] = "title";
 const char kTargetDescriptionField[] = "description";
@@ -753,6 +754,9 @@ base::DictionaryValue* DevToolsHttpHandlerImpl::SerializeTarget(
 
   std::string id = target.GetId();
   dictionary->SetString(kTargetIdField, id);
+  std::string parent_id = target.GetParentId();
+  if (!parent_id.empty())
+    dictionary->SetString(kTargetParentIdField, parent_id);
   dictionary->SetString(kTargetTypeField, target.GetType());
   dictionary->SetString(kTargetTitleField,
                         net::EscapeForHTML(target.GetTitle()));