First cut at "content handling" support in Mojo.

mojo/shell/ui_service_loader_android.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_SHELL_UI_SERVICE_LOADER_ANDROID_H_
 #define MOJO_SHELL_UI_SERVICE_LOADER_ANDROID_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "mojo/service_manager/service_loader.h"
 
 namespace mojo {
 
 class ServiceManager;
 
 namespace shell {
 class Context;
 }
 
 // ServiceLoader implementation that creates a background thread and issues load
 // requests there.
 class UIServiceLoader : public ServiceLoader {
  public:
   UIServiceLoader(scoped_ptr<ServiceLoader> real_loader,
                   shell::Context* context);
   virtual ~UIServiceLoader();
 
   // ServiceLoader overrides:
-  virtual void LoadService(ServiceManager* manager,
-                           const GURL& url,
-                           ScopedMessagePipeHandle shell_handle) OVERRIDE;
+  virtual void LoadService(
+      ServiceManager* manager,
+      const GURL& url,
+      scoped_refptr<LoadServiceCallbacks> callbacks) OVERRIDE;
   virtual void OnServiceError(ServiceManager* manager,
                               const GURL& url) OVERRIDE;
 
  private:
   class UILoader;
 
   // 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 LoadServiceOnUIThread(ServiceManager* manager,
                              const GURL& url,
-                             ScopedMessagePipeHandle* shell_handle);
+                             ScopedMessagePipeHandle shell_handle);
   void OnServiceErrorOnUIThread(ServiceManager* manager, const GURL& url);
   void ShutdownOnUIThread();
 
   scoped_ptr<ServiceLoader> loader_;
   shell::Context* context_;
 
   // Lives on the UI thread. Trivial interface that calls through to |loader_|.
   UILoader* ui_loader_;
 
   DISALLOW_COPY_AND_ASSIGN(UIServiceLoader);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_UI_SERVICE_LOADER_ANDROID_H_