First cut at "content handling" support in Mojo.

mojo/service_manager/background_shell_service_loader.cc

 // 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.
 
 #include "mojo/service_manager/background_shell_service_loader.h"
 
 #include "base/bind.h"
 #include "base/run_loop.h"
 #include "mojo/service_manager/service_manager.h"
 
 namespace mojo {
 
 class BackgroundShellServiceLoader::BackgroundLoader {
  public:
   explicit BackgroundLoader(ServiceLoader* loader) : loader_(loader) {}
   ~BackgroundLoader() {}
 
   void LoadService(ServiceManager* manager,
                    const GURL& url,
                    ScopedMessagePipeHandle shell_handle) {
-    loader_->LoadService(manager, url, shell_handle.Pass());
+    scoped_refptr<LoadServiceCallbacks> callbacks(
+        new ServiceLoader::SimpleLoadServiceCallbacks(shell_handle.Pass()));
+    loader_->LoadService(manager, url, callbacks);
   }
 
   void OnServiceError(ServiceManager* manager, const GURL& url) {
     loader_->OnServiceError(manager, url);
   }
 
  private:
   ServiceLoader* loader_;  // Owned by BackgroundShellServiceLoader
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundLoader);
@@ skipping 15 matching lines @@
   if (thread_) {
     if (quit_on_shutdown_)
       task_runner_->PostTask(FROM_HERE, quit_closure_);
     thread_->Join();
   }
 }
 
 void BackgroundShellServiceLoader::LoadService(
     ServiceManager* manager,
     const GURL& url,
-    ScopedMessagePipeHandle shell_handle) {
+    scoped_refptr<LoadServiceCallbacks> callbacks) {
+  ScopedMessagePipeHandle shell_handle = callbacks->RegisterApplication();
+  if (!shell_handle.is_valid())
+    return;
+
   if (!thread_) {
     // TODO(tim): It'd be nice if we could just have each LoadService call
     // result in a new thread like DynamicService{Loader, Runner}. But some
     // loaders are creating multiple ApplicationImpls (NetworkServiceLoader)
     // sharing a delegate (etc). So we have to keep it single threaded, wait
     // for the thread to initialize, and post to the TaskRunner for subsequent
     // LoadService calls for now.
     thread_.reset(new base::DelegateSimpleThread(this, thread_name_));
     thread_->Start();
     message_loop_created_.Wait();
@@ skipping 41 matching lines @@
 
 void BackgroundShellServiceLoader::OnServiceErrorOnBackgroundThread(
     ServiceManager* manager, const GURL& url) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());
   if (!background_loader_)
     background_loader_ = new BackgroundLoader(loader_.get());
   background_loader_->OnServiceError(manager, url);
 }
 
 }  // namespace mojo