First cut at "content handling" support in Mojo.

mojo/service_manager/background_shell_service_loader.h

 // Copyright 2014 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 MOJO_SERVICE_MANAGER_BACKGROUND_SHELL_SERVICE_LOADER_H_
 #define MOJO_SERVICE_MANAGER_BACKGROUND_SHELL_SERVICE_LOADER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/simple_thread.h"
 #include "mojo/service_manager/service_loader.h"
 
 namespace mojo {
 
 // TODO(tim): Eventually this should be Android-only to support services
 // that we need to bundle with the shell (such as NetworkService). Perhaps
 // we should move it to shell/ as well.
 class MOJO_SERVICE_MANAGER_EXPORT BackgroundShellServiceLoader :
     public ServiceLoader,
     public base::DelegateSimpleThread::Delegate {
  public:
   BackgroundShellServiceLoader(scoped_ptr<ServiceLoader> real_loader,
                                const std::string& thread_name,
                                base::MessageLoop::Type message_loop_type);
   virtual ~BackgroundShellServiceLoader();
 
   // ServiceLoader overrides:
-  virtual void LoadService(ServiceManager* manager,
-                           const GURL& url,
-                           ScopedMessagePipeHandle shell_handle) OVERRIDE;
+  virtual void Load(ServiceManager* manager,
+                    const GURL& url,
+                    scoped_refptr<LoadCallbacks> callbacks) OVERRIDE;
   virtual void OnServiceError(ServiceManager* manager,
                               const GURL& url) OVERRIDE;
 
  private:
   class BackgroundLoader;
 
   // |base::DelegateSimpleThread::Delegate| method:
   virtual void Run() OVERRIDE;
 
   // These functions are exected on the background thread. They call through
   // to |background_loader_| to do the actual loading.
   // TODO: having this code take a |manager| is fragile (as ServiceManager isn't
   // thread safe).
-  void LoadServiceOnBackgroundThread(
-      ServiceManager* manager,
-      const GURL& url,
-      ScopedMessagePipeHandle* shell_handle);
+  void LoadOnBackgroundThread(ServiceManager* manager,
+                              const GURL& url,
+                              ScopedMessagePipeHandle* shell_handle);
   void OnServiceErrorOnBackgroundThread(ServiceManager* manager,
                                         const GURL& url);
   bool quit_on_shutdown_;
   scoped_ptr<ServiceLoader> loader_;
 
   const base::MessageLoop::Type message_loop_type_;
   const std::string thread_name_;
 
   // Created on |thread_| during construction of |this|. Protected against
   // uninitialized use by |message_loop_created_|, and protected against
   // use-after-free by holding a reference to the thread-safe object. Note
   // that holding a reference won't hold |thread_| from exiting.
   scoped_refptr<base::TaskRunner> task_runner_;
   base::WaitableEvent message_loop_created_;
 
   // Lives on |thread_|.
   base::Closure quit_closure_;
 
   scoped_ptr<base::DelegateSimpleThread> thread_;
 
   // Lives on |thread_|. Trivial interface that calls through to |loader_|.
   BackgroundLoader* background_loader_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundShellServiceLoader);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICE_MANAGER_BACKGROUND_SHELL_SERVICE_LOADER_H_