First cut at "content handling" support in Mojo.

mojo/shell/ui_service_loader_android.h

Index: mojo/shell/ui_service_loader_android.h
diff --git a/mojo/shell/ui_service_loader_android.h b/mojo/shell/ui_service_loader_android.h
index ebe6df9800ab2f97405e33bf659296ce6bcf13fa..4eba373fb04d9f0b74cb3c2de62f8637de00e42d 100644
--- a/mojo/shell/ui_service_loader_android.h
+++ b/mojo/shell/ui_service_loader_android.h
@@ -25,9 +25,10 @@ class UIServiceLoader : public ServiceLoader {
   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;
 
@@ -40,7 +41,7 @@ class UIServiceLoader : public ServiceLoader {
   // thread safe).
   void LoadServiceOnUIThread(ServiceManager* manager,
                              const GURL& url,
-                             ScopedMessagePipeHandle* shell_handle);
+                             ScopedMessagePipeHandle shell_handle);
   void OnServiceErrorOnUIThread(ServiceManager* manager, const GURL& url);
   void ShutdownOnUIThread();