Implement BroadcastChannel

third_party/WebKit/public/platform/ServiceRegistry.h

 // 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.
 
 #ifndef ServiceRegistry_h
 #define ServiceRegistry_h
 
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 #include "public/platform/WebCommon.h"
 
 namespace blink {
 
+// Implementations of blink::ServiceRegistry should be thread safe. As such it
+// is okay to call |connectToRemoteService| from any thread, without the
+// thread hopping that would have been necesary with content::ServiceRegistry.
 class BLINK_PLATFORM_EXPORT ServiceRegistry {
 public:
     virtual void connectToRemoteService(const char* name, mojo::ScopedMessagePipeHandle) = 0;
 
     template <typename Interface>
     void connectToRemoteService(mojo::InterfaceRequest<Interface> ptr)
     {
         connectToRemoteService(Interface::Name_, ptr.PassMessagePipe());
     }
 
     static ServiceRegistry* getEmptyServiceRegistry();
 };
 
 } // namespace blink
 
 #endif