Renderers should obtain browser InterfaceProvider by connecting to browser

services/shell/public/cpp/lib/interface_registry.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/shell/public/cpp/interface_registry.h"
 
 #include "services/shell/public/cpp/connection.h"
 
 namespace shell {
 
@@ skipping 36 matching lines @@
   DCHECK(is_paused_);
   is_paused_ = false;
 
   while (!pending_interface_requests_.empty()) {
     auto& request = pending_interface_requests_.front();
     GetInterface(request.first, std::move(request.second));
     pending_interface_requests_.pop();
   }
 }
 
+void InterfaceRegistry::GetInterfaceNames(
+    std::set<std::string>* interface_names) {
+  DCHECK(interface_names);
+  for (auto& entry : name_to_binder_)
+    interface_names->insert(entry.first);
+}
+
 // mojom::InterfaceProvider:
 void InterfaceRegistry::GetInterface(const mojo::String& interface_name,
                                      mojo::ScopedMessagePipeHandle handle) {
   if (is_paused_) {
     pending_interface_requests_.emplace(interface_name, std::move(handle));
     return;
   }
 
   auto iter = name_to_binder_.find(interface_name);
   if (iter != name_to_binder_.end()) {
@@ skipping 20 matching lines @@
   if (!connection_ ||
       (connection_ && connection_->AllowsInterface(interface_name))) {
     RemoveInterface(interface_name);
     name_to_binder_[interface_name] = std::move(binder);
     return true;
   }
   return false;
 }
 
 }  // namespace shell